Garbage Santa will reward you for learning this skill.
He'll put all kinds of nice inflatable stuff out at the curb for you.
Step 1: Inflate
Big airmattresses often have a big deflation cap and a smaller inflation valve. I usually use the big cap.
One handy trick to know is the mattress inflates a lot faster if you blow the air AT the big intake instead of IN the intake. That's because the air jet from your blower entrains a bunch of surrounding air and sucks it into the mattress along with it.