Ask HN: Design for a non-designer

Hello, I've been working on an app for android (game) in my spare time, learning android as I go, everything has turned out how I've wanted except the look and feel, UI, UX, I would consider all of those to fall under design. I plan on trying to build some websites/webapps eventually as well, learning as I go. I'm wondering if perhaps there's some guidelines for good design, tools that I'm just not aware of, or anything else that could help me become a better designer. Even if I can improve on my design skills though, I feel like at the end of the day I'm not a graphic artist and these things are just not possible for me.

I've also thought about getting another person to do design, but I feel like I really don't have a good enough understanding of what good design is and how to work with someone who just does the design. Are there any good guides and/or tools people have read/used to help in design, whether for a mobile app or website? Thanks!