If your going to re-due the deck change out the skimmers at the same time.

Just make sure the middle of the new skimmer lines up with your optimum water level.

Hire a contractor that specializes in this kind of repair.

The new skimmers need to be tied to the pool shell with rebar (doweled in to shell and epoxied) and concrete pour around the skimmer to encase the rebar. Do not let any one set the skimmers next to the pool shell and pour concrete around it. This is a sure way to leaks in the future.

Hope this helps