I think you will find that if you are careful, watch how things come apart and are mechanically inclined you should do well. Read lots, and maybe ask around to see if there is some old fellow locally that used to fix cameras. Many older people will gladly help someone learn a dying art.
And whatever you do, don't become discouraged when you screw up. You will make mistakes. Just don't keep making the same ones over and over again.
Above all, have fun. The pride you will get from saving some mechanical marvel from the trash bin is well worth the effort.