Z4 roll bar cover removal - any tips?

I just bought the mesh wind screen kit and plan to do the install myself. It requires removal and replacement of the roll bar covers. Any tips on how to remove the original covers? Or even the seat belt guide cover to get to the screw to remove it?

Here is a great guide with pics: http://forums.bimmerforums.com/forum....php?t=1226398

Exactly what I was looking for - thanks!