- Focus on learning and having fun.
- Don't crunch, stick to your normal schedules
- Try to plan a bit on day 1.
- Cut your planning in halve as that's what you'll actually be able to do.
- Playtest as often as you can with friends and others as you'll never realize how unintuitive your choices are until you see someone else completely miss it.
- Try to make a game design document. It's a tool that can be incredibly usefull, doesn't have to be longer than a page, and basically tells you exactly how to make your game concept.
- Have fun!!!
Probably plenty more tips to give but these ones came to mind.