I need to remodel my pool. I have a kidney shaped, paster, apprx. 15K - 16K gal pool and by remodeling I mean, re-plastering and re-tiling. I also need to take out the coping that goes around the pool and fix the concrete around the pool. I submitted couple quotes request, but need to find what are the right questions I need to ask the contractor? Most importantly what are the correct answers to those questions?