Did you contract the pool yourself?

If so, you need to call the nearest SCP branch, and get plasterer names (not recommendations; don't ask) from them. But, you'll have to understand that you are going to be at the bottom of the list, during the time of year when the list is the longest. EVERYBODY wants their pool done RIGHT NOW when it's warm, and good subs are (1) already busy, and (2) going to give priority to their regular customers (ie, PBs) rather than you.

If you did NOT contract it yourself, than the pool builder should get involved -- it's his job to get qualified subs on the job, on time.