Drawing. I fuss, I tweak, I erase, I redraw, I edit, rinse and repeat. I mentally beat myself up over a piece. I get frustrated. Sometimes I think about giving up. But then... after a few hours of work, I take a step back and say... "You know... that actually looks okay!"
Don't let the bumps in the road dissuade you. Figure out what you dislike. Learn from your mistakes. Improvise, adapt, overcome. And most importantly of all... USE REFERENCES. Like... I was struggling to draw the hands in this piece... so I just plopped my hand on the table and took some pictures with my smartphone to use as a reference.