Yes, it's frightening and anxiety-producing when you're first diagnosed. I'm glad you found this forum, which gives LOTS of two ESSENTIALS -- compassion and knowledge. I'm sure many others will 'chime' in with their support and feedback. The first thing is to find out as much as you can about your situation, which is best achieved I think by having a team that is experienced with acoustic neuromas look at your MRI pictures. I think I'm right that most teams expert with ANs are also expert in meningiomas, so they could give you the whole picture. I have been very pleased with the team I found at UWashington (Seattle) that includes a otolarynologist surgeon (ear and balance expert), a base skull neuro-microsurgeon, and a base skull radiation oncologist. If you can't find a TEAM that gives you all the options in an open forum/discussion, the next best would be to consult individually with one of each and get their opinions. The ANA organization is right is emphasize the importance of finding those with acoustic neuroma EXPERIENCE.
The size stated in the MRI report would imply that you DO have options - wait and watch, radiological procedures (Gamma Knife, or Cyberknife, ...) or microsurgery (for which they are also several decidedly different procedures).
So, after you know all the physical facts about your AN etc, then start reading here and elsewhere about the different choices and decide which fits best for you. We're all different, not just in the physical realities of our ANs, but in what feels right to us. At a get-together in November, another gal and I were comparing notes -- to her, it was really important to "get the thing out", whereas I knew from experience the difficulties of even successful microsurgeries on the brain, so I was happy to choose Gamma Knife.
There's lots of experience and knowledge on this board, but it can also be overwhelming to try to sort thru it, so please feel free to ask questions. Also, join ANA and get the brochures; they're very helpful in clarifying and outlining things.
Mainly, please know that you're not alone, there are many of us who have gone through what you're experiencing. It's a blessing that the internet brings us together.
Where are you located?