Started at 420+, but had been as high as 460# in the past. Lost about 130, gotten under 300# when my maintenance kicked in at 9 months out (I had gastric bypass), which meant the rapid weight loss period was over and loss became much slower but still is steady, slow and steady. It is great you are thinking of this now. I did not do this until 63 years old and wish I had done it at your age. I had led a full active life, even flying 30 times a year with a seat belt extension, but at 60 years old my normally healthy bod finally did what the docs had always said it would do -- sleep apnea, diabetes, edema, heart problems, bad cholesterol readings, etc. I also was at risk of losing mobility -- walking and running my small farm were huge barriers. I missed alot with my kids because of the weight and it certainly effected my relationship, even though we are going on 40 years together.
So, now, 11 months out, diabetes 90% better; edema gone; heart strong; blood readings perfect. The apnea goes away for some, but mine is likely genetic as a slim dad and a slim brother both had severe apnea. I will have a sleep study when I am at goal weight but likely will still use the CPAP.... not problem. My mobility is so much better. I can ride a bike again, swimming is much easier. Today, spent the entire day maintaining irrigation ditches and working my greenhouse, no problem at all. Walking my dog three times a day, no problem.
BTW, my results are fairly typical. Negatives -- the first week was a bit painful, but could get out within 10 days The first month post surgery was challenging, mainly learning to eat so differently, quantity so much less, etc. but now am used to it without any real challenges. I do eat too many carbs, but not to much excess really, am working on that, guess what I am saying that food challenges don't stop. I found that the rapid weight loss was very debilitating -- did not have much energy even though almost always ate healthy according to instructions and took my Vitamins etc. I was actually glad when the loss slowed, as I needed the energy in my work. It is tempting to declare victory and say that with these great results, that is enough. However, I have been fat since I was 3 years old, and I want to experience not being overweight! I did not have any unusual prep instructions, pretty routine.
You really deserve to have this monkey off your back. I encourage you to reclaim your life!