DOs and DON'Ts of Acoustic Guitar Recording

DO keep your strings fresh (and keep the ends cut short)
DO wash your hands before and after playing
DO listen to the instrument to find the best mic placement
DO wear closed-back headphones to avoid escaping noise
DO find the spot in the room where the guitar sounds best
DO try to breath quietly through your nose (yes this is a problem sometimes!)
DO try to stay in the same position in front of the mics
DO try different thicknesses of picks for different sounds

DON'T forget to tune often
DON'T place your mics close to the sound hole
DON'T stop if you make a mistake
DON'T assume the built-in pickup actually sounds anything like your guitar, not to say it can't be useful at times
DON'T forget to empty your pockets of keys, change and cellphone
DON'T rush through the recording, take your time now to get it right.