Keep your old clothes.. don't get rid of them until they absolutely don't fit anymore. 20lbs is too much to be lifting while you're healing. Ask your surgeon when you can do heavy lifting. I had double hernia repair along with my sleeve and wasn't allowed to lift 10lbs for 8 weeks. Post op tips: take a pillow with you for the ride home after surgery.. you will place it on your abdomen and apply pressure when going over bumps in the road. Figure out what protein shake you like best now, you'll be drinking that for 1-3 weeks (depending on what your nutritionist says). Buy your vitamins now that way you have them after surgery.. make sure they are liquid/sublingual/chewable. I get mine from Walgreens but they are on amazon too.. Optisource multi vitamin for post bariatric surgery. Start taking biotin now (it may stop the hair loss before it starts). Buy lots of sugar free jello, and sugar free popsicles..that will also be part of your diet for 1-4 weeks. The hardest part is the eating phases.. you will want to eat things your stomach isn't ready for.. stick with the plan they give you- it's for your safety, your new stomach needs time to heal and can't digest certain foods before it's healed. No food warrants a trip to the emergency room. Check on bariatric pal's forums frequently, there's a wealth of support and information. When in doubt, call your nutritionist or surgeon. If you are nervous, let them know and they will give you a mild sedative similar to xanax before you go into surgery. You'll be fine, this is a great decision you have made. Best of luck!