my order of checks:
1.) look at hands
2.) count fingers on the hand
3.) try to press finger through palm
4.) pull on skin on the edge of my thumb to see if it stretches
5.) pinch my hand hard to see if it hurts
6.) try to press my tongue through the roof of my mouth
7.) try to press my tongue through my teeth
8.) close one eye to check the existence of my nose
9.) pinch my nose and try to breath
if those all pass you're in reality, if any fail you've either seriously injured yourself or you're in a dream :P