Thanks for your question A lot of people that are bigger want to ask the same questions but are too embarrassed to ask. The answer is maybe not as straight forward as you may think and it depends on your individual realities. We always want the patients to be as "fit as possible ", however one can never escape genetics and family resemblance. Therefore, the short answer is you should be within 15-20% of your ideal weight. If however, you lead a very regular workout routine and clean diet and have for many years there are things to consider. First consider a surgery for weight reduction or bariatric surgery. Second if you are not able to do that and religiously lead a clean lifestyle, and are willing to remain "full" figured a body shaping surgery, such as the ones you proposed maybe reasonable. Remember that the goal of any good cosmetic surgery face or body, is the pursuit or restoration of an attractive shape. This may include the tightning of skin like a tummy tuck or breast lift which have the compromise of scar and other negatives. Don't loose hope in the time consuming dedication to a healthier and fitter you. Work hard, set and meet your goals. Consider bariatric surgery consultation. Then you will be ready for a new figure where your skin hugs to your new shapely body. Good luck! Invest the time, about 12 months and you should be good.