I got both Breast augmentation and SRS done at the same time and didn't really have a problem. Out of the two my Boobs were the most painful but while in the recovery room I was able to move enough as was required. Once your out of the hospital a few days later it's uncomfortable but not unbearable and your motion isn't really impaired that much.
I had mine done at Dr Chettawut's and I have to say I am happy with the results, obviously this is no advert for him, only to say that the procedure I had was sub-muscular via the armpit. There the nurses help you with dilation the first 2 days once the packing is out, which is a good number after the surgery itself. The first few dilation's are just plain hard, but I don't think the breasts contributed to them being hard.
Dr Chettawut requires breast massage (or smashing your boobs up against a wall), that can be a bit challenging the first few times but it becomes routine (and boring) very quickly. I certainly don't regret getting both done at once, and am glad I didn't need 2 anesthesia's for it.
HTH Arielle