My AN is 1cm and I had symptoms for 8 years before they got bad enough for me to get to the bottom of the problem with an MRI. So, it was smaller than 1cm at some point and causing me balance, hearing and tinnitus problems on and off. FWIW, my symptoms fluctuate in severity, so you may get some of that too.
All of this will get easier to digest with time. These tumors are a pretty minor thing in a very major location. Lot's of people have a pretty easy time with treatment or observation. Initially, you will be watch and wait, also called observation. You are doing that right now, even if you move pretty quickly to treatment. Just so you know, you are not crazy if you decide to WW for a while. WW is not some kind of hair-brained scheme for people who are too cheap to pay their copay for treatment. There are upside and downside risks to all three approaches, WW, surgery, and radiation, so there is no clear path. Also, consider your age when you sort out what you want to do. I think age is a big factor in decision making, but it often goes unmentioned in discussions about "what should I do..."