No problem, man! Oh, and a tip I can give you from my personal experience, is that photoshop isn't like drawing on paper. You can always erase parts, reshape them, spin them around, add photographs for texture, make 3D renders in some other software and use those as a base for your sketch, whatever, you can't break any rule if there aren't any rules to begin with. So try to be flexible and don't get too stuck on the mindset that you are painting on a digital sheet of paper.
I think that's all the advice I can give that isn't excruciatingly specific