+ Don't run an instance for more than 1000 people if you are a single admin with admin experience.
+ Don't run an instance for more than 10.000 people. Just don't. You can't handle it if you are not planning to employ people full time.
If you want to run an instance for a community with more than 100 people, pick a good and motivate friend to help you. Find someone you trust to help. Someone you trust in helping you do the ugly decisions that will come.