I have found Adobe's masking stuff to be pretty hard to use effectively, including their latest efforts in both CS5 and CS6. I finally resorted to trying Topaz ReMask, and I can enthusiastically endorse it. Topaz has some very nice videos on YouTube that explain how to use their stuff, too. I was able to do some composites with ReMask within an hour of getting it installed. I've spent more time just reading the tutorials on CS5, let alone getting anything done.
_____ Brian... a bicoastal Nikonian and Team Member
My gallery is online. Comments and critique welcomed any time!