Hmm, I think the first step to this would be to see where in your process takes the longest first.
Doing this will help you understand that because you know this is the longest process, that you need to focus on the shorter processes first.
This is very crucial, especially when you get deadlines involved. It adds to stress which causes problems for creativity.
Second, try to understand what it is that you don't need?
Ask yourself, is this too detailed? Am I focusing on things the audience won't see or care much about? Can I tell my story I'm trying to tell without some of the elements I'm trying to put into it?
Taking the time to identify what it is that is causing the hang ups is probably what you want to focus on.
Then once you know the area, then keep drawing and try to force yourself to remember that not every single little detail is going to be seen. Focusing on making your color theory, composition, shadows, lighting and the appeal of your character are all very important so try focusing on those instead.
