Just to confirm a few notes and issues I ended up having with the "Guide1.pdf" in the hope it might help clarify a few things for others:
1. When installing WAMP, it might be best, or it is easily possible to install it wherever you like. In fact some say it's probably best not on your main system drive. I installed mine to a smaller drive (80GB) I have in my system which might be better for all the small files that will eventually collect across the various intended local development sites.
2. The guide suggests to use the name "test" in the www directory. This may lead to confusion later in the phpMyAdmin/mySql interface where after installing wampserver2.2d, a default database of that name (test) exists as part of the initial install. The existence of this 'test' database is apparently not that important but if you delete it you will not be able to run some test at some point if needs be. Basically avoid creating a website called test to avoid confusion with the database of the same name later.
3. More confusion was found on the 'step 4: Database' instructions in the guide. It took me a while to realise what was going on. Basically avoid using the word 'root' in the "Database name" box. This box can be given any name you like and I would perhaps suggest use something useful pertaining to the site you are creating. Basically, the name you put in this box will, when clicking the Next button, automatically create a new blank database in that name. This is what your new site will use to store it's data. If like me you are planning on building or running several development sites or versions, you will be wanting those names to mean something meaningful. If you do several installs, like I did at first, with the word 'root' in there for all of them, I think you will be making all your sites use the same database and that is not good at all.
4. It's worth noting that the database creation happens automatically when using the installer locally (e.g. via WAMP or XAMPP, etc.), some instructions out there say you have to set a database up manually before installing Joomla but I have found this a waste of time. Database creation may not happen automatically when installing via your hosting company. If Section 4 gets stuck or after the Joomla install you don't see the database in the database section of phpMyAdmin, then you will need to create one manually before hand via that section on phpMyAdmin and then try another install of Joomla 2.5
5. As a note for the next box called "Table Prefix", this doesn't really matter what it is but it must end with an underscore character and the advice to the right of the box suggests keep it to three or four characters despite there being six by default (inc the underscore). My suggestion here is to either keep it as is or shorten it a bit. Again, if you are creating more than one website (via another Joomla install later) you can alter it slightly (the box seems to retain the last used settings when you do the next install), then later one day, when you are editing databases you'll not get confused as to which database you are in and neither will your software. You might also want to keep a note of this prefix for later reference perhaps when moving your development site to a live site and using something like Akeeba (I'm not sure yet, I haven't got that far!)
6. Regarding the Username and Password boxes on that Step 4 page. These are to do with the phpMyAdmin user permissions, nothing to do with Joomla except that by filling them in you are linking a database to Joomla and the username and password you give here are like the login for Joomla to link with phpMyAdmin. I found a useful video on YouTube (http://youtu.be/Db7Hxx8mMGA
, see from about 3:29, don't worry that it's for XAMPP, the phpMyAdmin part of WAMP is exactly the same software), basically it says you don't have to use the 'root' admin user and you can create your own username under the localhost Privileges section. I created a user using my more familiar username and password that I'll always remember and now all I do is enter those in the the Joomla installer Section 4 areas (along with my preferred database name as in point 3 above), then all will be installed just fine with the database all linked to me as the user and not some weird 'root' user that I might forget later.
7. You will see a red box after installing WAMP in phpMyAdmin that says something about the 'root' user not being password protected. I'm not sure how important this is to do on a local server that is just for testing and will never be used as a real server dishing out stuff onto the internet, but it can't harm to password protect the root user just in case something gets into your system that shouldn't. You basically have to set click on the 'Edit Privileges' nest to the 'root' users, I gave them one of my standard passwords and clicked okay. Almost as soon as you do that you will probably think something has gone wrong because you'll loose access to phpMyAdmin. This is simply because you have now password protected it and you are not allowed in any more. To fix this you need to edit a file called config.inc.php, it's in wamp\apps\phpmyadmin(yourversion) look for this:
$cfg['Servers'][$i]['password'] = '';
$cfg['Servers'][$i]['AllowNoPassword'] = true;
At the end of the first line you will see what looks like " but these are actually two apostrophes. You need to put your new 'root' password in there. On the second line change true to false and save the file. You should now be able to access phpMyAdmin again. If not try clearing your browsers cache, that had me fooled for a short while!
You then should be good to go for working on your Joomla sites. Hope that helps someone. I don't guarantee these are all the right answers but I'm fairly positive I now have a good understanding of how this all works with Joomla 2.5.2 and wampserver 2.2d (March 11 2012) - What a shame there is so much old and misinformation out there, it takes time finding out these basic things that really should be in simple (& properly updated) 'how to' scenarios on the various software websites.
One last thing, for those wanting to open up use of the .htaccess file, see here:http://www.minitek.gr/tutorials/joomla-16-tutorials/development-tutorials/item/234-how-to-use-htaccess-in-wamp.html