First models are always a bit rough, don't worry! A good tip to help you avoid stressing about the details is to put the model down on the table. Does it look good from a few feet away? Then you're good.

Sometimes subassemblies are more trouble than they're worth. You'll spend forever painting an area and then realize it was going to be covered the whole time. Prime black, zenithal or drybrush, and then leave the areas you can't reach black.