It depends on a lot of factors, but it’s NOT something you should be worried about if you’re looking to make a lifestyle change. The payoff outweighs the negatives, almost always. :)
Excess skin can be helped with proper hydration, sleep, proper nutrition and gradual weight loss: the skin is like an elastic band. Some people experience little to no excess skin, or very minimal. Most, especially those who’ve lost a lot of weight, do not regret doing so because of a little extra skin. :)
Don’t worry too much about it! Our bodies aren’t designed to be perfect. We just do the best we can with what we’ve got!