You guys are making me doubt myself haha. I have enough mechanical and electrical skills to maintain the bike myself (I've done brake lines, exhaust, oil changes, and other minor electrical things here and there on my old golf). But one day my starter solenoid crapped out on me and I had to leave my car at school for the next couple of days and replace it in the autoshop. I just don't want things like this happening when I need to get to work because I can't walk nor take public transportation there.
Are there things like this that can go wrong with an old bike? Anything that would need me to order a new part and wait? Or can most of the issues be dealt with basic tools and a little elbow grease?
The elbow grease and tools part is easy. Sourcing parts for a bike that's 2 decades old may be an issue. I mean, they are simpler machines and more often then not you'll be MacGyvering something on the side of the road, but that's part of the fun of owning an older bike. Fun being the subjective term.
if you need reliable transport, the answer is simple, get something newer that's in your price range.