I go along just fine, then something just happens.
I remember that happening in my beginning days of using Blender (and I guess that happens with 3D modeling in general); I’d follow a tutorial (any tutorial, not only on CGCookie) to the letter and then at some point it went all wrong and I couldn’t get the wanted result…re-watching that part several times didn’t help, so I also started over and then it went ok…up till the next part in the tutorial where I messed up (and couldn’t find why).
This goes away with time! It will become easier and then other things will get challenging; you will never stop learning. Do not give up, it’s an amazing journey!