From reading between the lines in your posts my advice is real simple, relax
It sounds like you are your own worst enemy here. By stressing over what you are doing you are making life much too hard for yourself.
During my class I started beating myself up because I kept making stupid mistakes and found it hard to master everything at once (coordinating all four limbs at the same time is hard). But I took a deep breath and reminded myself I was there to have fun. If I failed, I failed, it was not going to be the end of the world. So I relaxed, listened to what they had to say and did my best. It suddenly became a lot easier when I took that self imposed pressure off.
If you have a bike to practice on, keep it simple at first. Pick a few things you want to improve on and go out there and work on it. Honestly it gets easier real quick once you master the basics. Then you get to spend the next 20 years practicing everything else