Rear Wheel Bearing replacement questions

[sasha055]

Hi,

I'm planning to tackle my rear wheel bearing this weekend and I have some questions:

I'm following instructions on renntech: http://www.renntech.org/forums/index.php?/topic/16729-rear-wheel-bearing-102/page__p__83721

1. Wheel hub, is it held in place only by axle nut? Do I have to undo something to take it out?
2. Ball Joint ... I have no idea what it is, where it is and how to use Ball joint separator.. . Any pointers there?
3. Pulling the axle, Seafeye talk about "a couple of whacks and the whole wheel carrier is able to move freely". What should I "whack"? is it hit the axle and expect it to go in or wheel carrier from the inside and expect it to go out?

I know it's going to be easier to just drop it at the mechanic and 700$ later it will be all good.. However I want to do it myself, it's cheaper and more fun, I really like to work on my car (it's new for me, I never even saw an engine before I bought the Boxster) and in case my other bearings go out I'll be prepared.

Any advice is greatly appreciated
Sasha