At least 2 people, try for 3 if possible. One on the inside of the pool and the other(s) on the outside. It will not be fun or easy nor will anyone be dry when it is done so dress for it and have LOTS of chlorine on hand to clean it out and to add to the water as some yuck will spill out.
I am hoping you have a deck as that will make is a little easier.
Goodluck!