Your friend is not talking bollocks. That is a very good idea. I do it too.
Also, try self talk. As in, ok, I need to do this, I have to work out this...calmy, not rushing at it. Another tip is to have your flight planned out as much as possible before you go. ie know what to expect at time such and such.. you general plan of attack at the circuit if the wind is *this* etc. This reduces the stress and therefore will reduce the "heat".
If you are getting hot, I gather you are opening an air vent, wearing cooler clothes etc. Drink water, carry some cool water with you. Vital for preventing kidney stones later on.
Good luck.
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reddo
A Feral Animal.