I made this simple video of me pressing a button on my watch and in after effects I then added a GUI so I could press it. But when I add the GUI, it sorta overlaps my hand so it shoiws instead of my hand. How do I fix this?
Video link = http://www.mediafire.com/?hbxrywub7u3a6v9
You need to do some roto work on your hand. You duplicate the footage layer, cut out just the hand, and put it on top of the GUI you made.
Do a search for Rotobrush Tutorials.
I strongly recommend that you work your way through the basic learning materials before trying to tackle a real project. Doing so will prevent a lot of frustration.
For basics of compositing, start here: