Many good things in this life happen slowly. Speed and hast invite mistakes, mishap or problems you don't need.
Sometimes loose skin can happen with modest weekly weight losses, simply because the person has achieved a weight, that has instigated too much damage to the elasticated nature of the skin, so it cannot reshape back to original levels.
Then at or close to journeys end, surgery is usually the only choice to fix the loose skin problems.
Slow and steady wins the race. It might be frustrating, but if you get your end goal(s), with few or no problems to deal with afterwards, it enhances your achievement more.