Breast lift/large implant to smaller implants? (Photo)

Hello, I am considering a breast lift and exchanging my 600 cc high profile silicone implants under the muscle for a much smaller implant, 300 to 325 cc silicone. I have absolutely no breast tissue. It’s just stretched skin so my concern is, will it be more difficult of a surgery to perform with deflated skin to get the desired result of a much smaller breast and is it feasible to go from 600 cc to 300 to 325 cc for a more natural look?