I hope this doesn't come across badly, but: breathe!
If you're new to Disney, I'm sure the information overload can be really overwhelming and feel almost impossible to fully understand. I recognize your frequent posts, concerns, and worries as something I did when I started out with planning our first trip 10 years ago.
The DISBoards are a great place for trip planning, but you can find opinions either way. If you are looking for negativity, you'll have no problem finding it. However, if you are looking for positive stories there are plenty of those as well. Some people hate HMH, while others love it. Some people hate fireworks and Fantasmic, while others love them. We personally love October, but like the comments you quoted, some people would rather avoid the month altogether.
I would not change dates that I have already planned. However, if you are concerned that you will have a bad time it may be worth moving it up to September to alleviate some of the anxiety. It's not worth the constant stress and worrying, trust me.