Is my goal weight reachable?

I'm still a pre-op, having surgery one month from today. Horray! I have recently decided on a goal weight of 143 lbs, which we be right in the middle of my healthy bmi range. I am 5'8". I am wondering how many people have reached their goals and how many have had to settle with not reaching goal. I feel like my goal is not reachable. I am starting at 312 as of today. I'm hoping to reach 300 by the time surgery rolls around if at all possible. So, I guess my question is this: Is it realistic to belive that I will be able to lose a total of 169 pounds which would be over 54% of my current body weight? If so, how can I use my tool to the fullest to ensure maximum weight loss?

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