Screen Replacement Tutorials
CoreMelt TrackX makes it very easy to do a screen replacement in FCP X within just a few seconds. If you're impatient here is our "One Minute Tutorial" on screen replacement.
More info on dealing with reflections and other issues
For more information on dealing with reflections and choosing the track area this tutorial will help.
Better tracking results overall
For tips on choosing the correct track area and getting better tracking results overall, this tutorial has useful pointers.