@Barlo,
I’m trying to learn Blender since 2009, really learn not just learn to follow tutorials. I’ve gave up a lot of times, because of just one thing: comparing my results with others results!
Last december, I’ve discovered CG Cookie and became a member and I have discovered that I was learning in a wrong way!!! Man, please, don’t give up because of it… There will be better modelers, animators, professionals than us forever!!!! Doesn’t matter how hard we try! I don’t care, anymore… I just compare my actual results with my yesterday’s results and if I see progress, I’m happy! And I see progress now!
Let’s do it together, man… Don’t compare your results with pro results!! You don’t need to do it… My wheel exercise is really terrible, bad modeling, bad application of modifiers! However, the result I could reach on it was much better than I used to achieve. I’m sure you have passed the exercise and you have reached what was required for that training… Pass the exercise, not being perfect. Keep moving forward, man!