Have to agree with finding a partner.. Evening shooting for many years. A bunch of friends and I get together all summer to shoot, evaluate and help each other and work with Folks who are just starting out. Having someone else( Knowledgable ) watch you shoot Can make a huge difference. As for one... If you are trying to see your arrow fly, you are not going to follow through correctly. You should not take you focus off the Aiming point until after your arrow hits. I tell folks to aim, focus, release when ready, but stay focused on the spot and after the arrow hits count to five keeping there focus and pin on the target. Doing this makes it impossible to see any issues with your bow or form but keeps you from dropping your bow or canting it to one side to see where your arrow may hit. Trust me your arrow will still be in the same spot after counting.. For this a wrist strap helps,as you are not grabbing your bow to keep it from falling and it is one less thing to think about.You really need a partner to watch you and give you good feedback. A proshop will help, but a partner is best as they will see you shoot allot more. Many clubs have regular shoots and if you can get involved that is usually a big help
Good Luck