We just finished a slideshow on how to install TSC in-wall speakers. This installation of our IW-D5 LCR front surround system took a little over an hour to complete. Most of the time was spent on planning and measuring. Once we were sure where to cut the holes, (that's honestly the hardest part!) it took no time at all.
This serves as a guide to how our in-ceiling speakers would be installed also, except of course they would be in the ceiling. ;)