Katie,
McKenna did my 3.0-3.5 cm AN in cerebellar pontine angle along with Barker. I found M as you and others describe. Barker is reputed to be an excellent surgeon, and he "hates clinic" as he remarked to me (I'd figured that out by myself). Follow up is what I found difficult. If Martuza emails, that is valuable for those who are up to emailing soon after surgery. Otherwise there are several layers of communication in order to get through when one needs advice.
What did McKenna say about nursing? I hope you can wait a few months, at least two, enjoy nursing your son, then do surgery. I found staff at MGH excellent. It was my fate to go to Spaulding Rehab for two weeks, and they were competent, too.
Mckenna did a fellowship at House, so ask him about the difference of opnioin on approach if you have a chance. I wish he were available via email.
Good luck to you.
Peanut