I've been playing for a little over a year. I bought a used bass w/practice amp & just went at it with some books for the first few months. Around about the 4th month I got myself a teacher who immediately pointed out that I would benefit from trying to keep my fretting hand closer to a 90 degree angle, rather than the 45 degrees I was holding it at. What a big difference that made in a positive way. I'm still working on not pressing my thumb so hard into the back of the neck when fretting. It's something I need to keep conscious of, but it's getting better. Most recently after trying to play a friends guitar, I realize that I've been fretting my bass strings by using more of the pads of my fingers rather than the fingertips (which has been sounding fine on bass, but impossible to play chords on the smaller string spacings of a guitar.) When I mentioned it to my teacher he said "Yeah, you should probably be playing close to 80% of notes with the tips". Frankly, I'm a little annoyed that he didn't catch it and point that out sooner. It got me wondering about the habits of others regarding bad form when you were a noob - what issues were they? and were you able to correct it or just continue going with your own flow??