i have been putting covering on since the 70's and have yet to use a heat gun on initial covering,i do however after my planes have sat for the non flying seasons and get wrinkles used a heat gun to tighten them up again.i try to keep several set of heat socks for the different colors.i don't know if it is just me or not but it seems to me that darker color coverings tend to be more troublesome than lighter colors?on wings i do like most here do,the bottom first but i start at the middle root of the wing and work out to the end then work each half to leading and trailing edge in either order.i tried using the heat gloves but they didn't work out so good for me too cumbersome.i think covering some people have a natural knack for it others have work harder at it.my first covering jobs the wing tips were the only parts that didn't come out the best but after a few covering jobs it got better.good luck