I think you should have fun. If fun equals learning how to work on a bike to you, go ahead and do it. You'll likely move up as you learn more, most of us do. If you run into specific problems, come back and ask. I would start with a good maintainence book; there are many and you can often find them cheap used. Richard's bicycle Book comes to mind-- if the bike is 1984, it's likely pre-index shifting, and older editions of Richard's have a good lo-tek basic tools repair section.