This assumes that you can and already do basic maintenance on your own, especially changing the oil.
I created this because while there are written instructions on changing Accord transmission fluid, I never found any pictures. In fact, the Haynes manual doesn't have these pictures!
Step 1: Locating the drain plug
Looking from the side, the plug is almost directly behind the passenger-side front wheel.
To remove the plug, you need a 3/8 drive socket wrench. *It does not take a socket, you must stick the 3/8 drive directly into the plug!*
Step 2: Draining the fluid
Draining the transmission fluid is best done on a level surface, so either:
1. Put jack stands under all four corners of the car
2. Use no jack stands and leave the car on the ground.
When draining on a level surface, 2.6 quarts of transmission fluid will come out. This is 1/2 of the total transmission fluid so yes, you are only changing half of it. If you drain it on an angle (that is, the front end is on jack stands, but the rear is not), you will drain more than the 2.6 quarts, but I don't know how much will come out. Therefore, unless you measure it, you will not know how much to put back in!