Explant and Breast Fat Transfer - one procedure or two?

Calcific capsules or capsules that are distorting anatomy should probably be removed during the implant removal procedure. Leaving a capsule behind is preferred if it is thin and pliable. Removing a capsule unnecessarily could result in bleeding and slight tissue loss. If your implants are silicone, your PS may suggest that both the capsule and implant be removed en bloc.
I usually perform the explant and lift first. The fat grafting I typically perform in about 3 months. Some of the success will depend upon existing tissue available for receiving the fat. Fat grafts should always be optimized with the best blood supply available. Fat is injected through multiple planes in small amounts to the tissue through one tiny incision under each breast. In general, the abdomen and thighs are preferred donor sites. The fat grafting will likely take several sessions to produce a similar result unless the breast implants were extremely small

For best fat survival, I would suggest first having your implants and capsules removed, and then doing the fat transfer at a second surgery once healed and the swelling has subsided. You might decide that you don't want any fat grafting.

Based on your description, the capsules should be removed at the time of implant removal. If capsules are thin, they can remain behind. If they are thickened or causing issues, they should be removed. Due to the trauma to the breast of removing the implant and capsules it may be recommended to have the fat transfer done in a separate stage. I encourage you to meet with a board certified plastic surgeon near you, as an examination and discussion of your goals will enable the most accurate opinion.