Then if you're reading this before noon on Saturday (December 10th) rush out the door and head to @TheBikeHouse behind Qualia Coffee up on Georgia Avenue in Petworth. For just a few bucks (between $5 and $10) you can get set up to fix your bike yourself--with guidance. You bring the bike (and the problem that needs to be taken care of) and they supply the tools, bike stands and know-how.
Today is the Bike House's last clinic of the season from 12-3pm. When they reopen the clinics next year, they'll be in a new spot, location tba.
In the meantime, get a sense of what The Bike House is all about here. Just click the button in the middle of the photo and enjoy.