My piece of advice would be to trust yourself. You are going to make mistakes. I am sure there is not an entrepreneur out there, there is not a business owner out there who said oh yah this is a very smooth process and I came up with this idea, I built it and everything worked perfectly just like I thought it would.  Everybody goes through these growing pains, struggles and self doubt. Every entrepreneur has these stories of yah we are struggling, things are hard, a lot of night working, trying to make this work. If you don't believe in yourself, if you don't believe in your product then you will never go anywhere.