I'm learning guitar after playing bass for years and it's making want to learn bass properly from scratch again. I only ever learned patterns without theory and have picked up so many bad habits!

My main tip is to learn the simple stuff and don't move on until you've got it nailed. Its easy to want to play the lead lines and solo away before you're ready.

Play chord after chord until you have the transitions completely perfected and concentrate on perfecting your rhythm. Learning how to hold a solid rhythm is the cornerstone of good playing. I've been so frustrated (as a bassist) over the years at the amount of guitarists that can solo/noodle/shred like a pro but just can't work tightly with the bass and drums.

Oh yeah, i almost forgot, don't turn down a university scholarship because your band is going on tour.