Removal of trim to access subwoofer

First off, Hi everyone! This is my first post, I've been trawling the boards here and looks a great forum with loads of good info.

Unfortunately, my sub has gone in my 06 plate A3 Sportback and after getting on to Audi to get a new one ordered up I would now like to fit it myself. In the mk4 Golf I had before, jobs like these were no problem to me but having only had the Audi for a few months I'm a little more nervous about steaming straight in!! So my question is can someone tell me how to remove the trim in the boot to get in about the sub, or point me in the direction of an idiots guide please?

Thanks in advance!

Cheers mate, I'll do that.