What is the correct way to remove/replace the t-top trim ?

If you're talking about the stainless steel trim, murphy's law says that you have to completely disassemble the tops, right down to the fiberglass panel.

Start by removing all of your accent trim, keep left and right seperate, then the weatherstrip. After the weatherstrip is removed, you can see how the trim is placed on the tops. Remove all screws, and then start prying up on the trim. You have to pry, because all underneath the trim pieces is that annoying "Gum Dum" black adhesive goo. Be careful prying, the fiberglass can chip and crack very easily. I'm talking from experience here. Use a wide, thin prying object, preferably soft. I found that a body filler spreader worked the best, and caused minimal damage, not like the putty knife I started with.

Good luck, and take your time, like I said, it chips REEEAAAAAAAAAALLLLLLLLLYYYYYYYYYY easy.

Thanks!