I haven't made it through all the great How-Tos in that forum yet. Now that's the way to do a How-To. With lots of pictures. One thing that caught my eye was he was using a screwdriver as a pry tool. There are nylon trim pry tools that I would use instead. Its almost impossible to damage trim pieces using them. They are well worth the few dollars they cost. In rare instances you still need the stiffness of a metal pry tool but not very often. Also, often just using yours hands is all you need. But there is nothing like doing a successful DIY & ending up with trashed trim from a pry tool slip. My 2 cents. Here is the general idea:
Also available on ebay.