I have been given an AG pool. 24 ft round. I think it has a beaded liner at present. It seems from reading in this forum I should invest in a new liner. Can it be an overlap or once a beaded always a beaded? Also I wondered at the steps for set-up. We have the site picked out and will level it, then what? Does sand go down before or after the walls go up? And where to go after that? Thanks for all the great info. Polly