About the detuning. Do you think the shop at the mountain will detune the board for me? And if I wax my board at home, do I need to remove the factory wax before?
Yes, but make sure that you say "Detune my tip and tail" and not "detune my board for me"
You can buy solutions that you can use to clean your base before you wax it. Most are citrus based, I think.