You'll probably get some more detailed technique advice from others, but I'll mention that you're definitely doing some things right. Your snatch had a big loop forward in the pull, which is why you missed it. But you can definitely snatch that and more with work and focus on perfect technique(actively pulling yourself under the bar, feeling it close to your body and face when you're turning it over). For staying warm between attempts, you shouldn't have that much time between attempts unless you're taking big jumps. If you're getting cold, just do some simple things like bodyweight squats and arm circles to keep your shoulders loose.
One other thing, and I totally don't mean this to sound like a jerk or anything. Lose the hat.