I signed up for a lesson in buoyancy control for this sunday. The lesson will be in a quarry I am not sure of the water temp. but the outside air temp.is expected to be in the low to mid thirties at the time of my lesson. I will be renting a 7 mil. suit. My question is will I be to cold to get the most out of this lesson or will I be okay once I am under water. I am assuming that the water will around 50 degrees but I am only guessing.