How easy or difficult it is really depends on what your trying to do. For this gun the light has a separate switch but for other of my guns the light is wired to the trigger so it's a little more complex. My tips would be to look at other peoples work and find styles and ideas that you like, also try to make it look authentic as if it could really work and look around were ever you go. You would be surprised how many everyday things I use in my guns that I used to just throw away. Have fun and thanks for your interest and your comment.