Any use begin looking at it?

[Lifeform]

Hi,

I'm a total newbie on both Joomla 1.0 and 1.5, but I wanna learn me this CMS system someday.

My questions are as follow:

1) Are there any use begin learning the 1.5 beta-version now? And 2) Are the differences between 1.0 and 1.5 version THAT big that all I've learned on 1.0 about templating, etc - are different in the new 1.5-version?

Also 3)

Is the 1.5 beta 2 version upgradable to the STABLE version when it's ready?

Kindest regards.