As most things, it is a learning experience. Going through it the first time helped me find things I need to watch for and to include in my writing. This allowed me to avoid the negative issues and work to include the positive.
I have a day job, so my writing schedule is rather fluid. I try to work a few hours each evening on either writing, editing, or reviewing. The weekends are when I get the most accomplished. But basically my schedule is to write whenever I have the opportunity.
I do. I try not to look at them as good or bad. I take encouragement from the positive one and try to learn from the negative ones. The most disappointing thing is when one receives a low rating but the person doesn't post a reason.
I normally have several books in the works, so if I hit a block on one, I’ll put it aside and work on another book. This allows me to go back later with a clear mind and things normally progress from there.