Their is some solid advice on this thread, every comment seems to be very respectful, it's nice to see. I've never competed but I have unfortunetly had to shed 82lbs, at 282lbs I was lifting some big weight and got used to being a big guy. I'd say it's the mental aspect that can bother you, if you are used to being bigger you will at some point along your road to getting lean face some mental road blocks. You may feel small or worry that you have lost a bunch of the muscle that you had under there. Honestly when you have a good amount of fat to drop the risk of muscle loss is much much lower, you will get weaker from less bodyweight so you don't have the same leverage but who cares?
Hiring a coach would be wise so you don't psych yourself out, they can tell you to cool it when you look in the mirror and feel small or weak. Even small changes right now would knock a good 40lbs off you pretty damn quick. I already see some great suggestions on here. I too am more of an endo, i'll tell you would helped me:
-start with 10 days zero carbs, this will at the very least drastically jump start fatloss and enhance insulin sensitivity
- 10-20grams fish oil
-walk daily, even use one of those pedometers on your phone, walking is low impact don't even worry about heartrate we are looking more for nutrient portioning and insulin sensitivity here 5000 steps to start, then aim for 10,000, this is general movement not cardio
-shorten your window of eating for the day, if you are up at 8am stop eating at 8pm giving yourself 12 hours of being in a fasted state
-to enhance things further do the above waking in a fasted state daily
-shorten your rest periods in the gym and encorporate supersets, this will make your workouts more efficient and keep your heartrate up, I know when I was at my heaviest I carried quite a bit about the weight on the bar and would rest easily 3-5minutes to move max weight, cut it to 1minute, 90 seconds if supersetting.
-Cycle your carbs, keep it super simple training days can be moderate carbs, off days zero or very low carbs
-up your fiber and greens significantly, i'm taking 40grams fiber, incorporate mixed berries, and mixed veggies
-eat as much as your protein from whole foods as possible to maximize the thermogenic effect of food
-do not worry about spiking insulin post workout, at this point its the last thing you need to worry about
-as above keep all carbs low glycemic
with the exception of post workout all meals should be protein/fat/greens.
To make it as simple as possible try out a paleo diet with starches post workout only. I think you could easily drop 50lbs or so before you even needed to consider hiring a coach as that fat will drop off you very easily at this point. A lot of the points I made above are to help your blood sugar/insulin sensitivity that is the biggest issue will having excess body fat, your nutrients are being shuttled more towards fat cells as right now you will not handle carbohydrates well.
Green tea, and berberine would be very helpful for you. As for peds, no need for clen/t3 etc at this point, also nothing much higher then a trt level of testosterone would be needed.
Hope this helps, I know it sucks man to come to this realization, just stick with it, as you can see we're all here to help. Good luck to you.