How easy is it to replace wood trim?

Does it just pop off and then back on?

What tool is needed?

Thanks

You might read this guy's DIY about installing his AUX adapter - he had to remove the trim to get to the radio.


http://www.mattmcnulty.com/325xi/DIY/aux_input.html

It's for a 3-series, but I'm guessing it's all pretty similar.