Hi, Dia - and welcome ~
I'm sorry that you have to deal with this situation (acoustic neuroma) but glad that you discovered the ANA discussion forums.
I underwent Retrosigmoid approach AN debulking surgery, not Translabyrinthine, but AN surgery is quite similar, only the angle of entry to the tumor changes.
Much of your recovery experience will depend on variables you can't know beforehand, such as the exact size (MRI scans only give an approximation) and location as well as the difficulty the surgeon encounters in removing the tumor (its removed in layers) and anything unusual that may occur during the surgery. Assuming the operation goes smoothly (we all assume that because it usually does) your ability to balance will depend on how much of the nerve was rendered inoperative by the tumor and how much your brain has already compensated for the change. Those with small ANs generally have to re-learn balance and those with larger ANs often have no trouble regaining serviceable equilibrium. (I was in the latter category.)
Adjusting to the loss of bilateral hearing can be problematic for some AN surgery patients. If your hearing has already diminished substantially prior to surgery, the adjustment will be relatively easy. However, if you go into surgery with reasonably good bilateral hearing and come out SSD (Single Side Deaf) it can be a bit traumatic. I had lost all hearing in the AN-affected ear prior to surgery so I really didn't have to adjust.
In an uncomplicated AN surgery recovery you'll need approximately six weeks to recover but 100% recovery can take a year. Even as your recovery progresses, fatigue is often an ongoing factor. Balance rehab is done with exercises and lots of walking, preferably on uneven surfaces (that was my main form of rehab). As noted, being SSD has it's limitations but one learns to adjust, as may AN surgical patients do. However, as your doctor said; you can always get the BAHA, later, if being SSD proves to alter your quality of life. It hasn't for me (more of a nuisance/size]) but that is something you'll need to find out for yourself.
Thanks for joining the forums. Our thoughts and prayers will be with you as your Big Day (May 24th) approaches.
Jim