I would simply ask you, of the two procedures you'll be undergoing, which one of them isn't really that important to you. That way, you can pick one surgeon who is the best trained in the important procedure, and he or she can just "wing it" on the the other one.
Okay, so that was all tongue in cheek: my clear advice to you is this - - pick the most qualified surgeon for each of these procedures. That means two surgeons. You should be able to find a couple that work together on these kinds of cases.
An OB/GYN MD is the most trained physician to perform your hysterectomy, and a Plastic Surgeon is the most trained physician in performing tummy tucks. The opposite cannot be said.
Lastly, make sure your "cosmetic surgeon" is board certified in Plastic Surgery. Board certification in another specialty means they are trained in something other than Plastic Surgery.
http://www.youtube.com/watch?v=PtjjfQ1oRSY
