Comment - If you're going to remove the passenger's side drain plug without removing the starter, and that's the right way to do it, disconnect the batteries. Otherwise, you'll shower yourself with sparks when you accidentally touch the wrench to the starter wire.
No offense, but that is NOT the right way to do it.
Removing the starter is not necessary at all, and you don't have to disconnect the batteries. If your near the starter wire, you're doing it wrong. You access the passenger side plug by going up the side (well behind the wires) and over the starter.
Properly accessed, a person is just nowhere near the starter terminals and wires.
I've done this three times now, so I'm pretty familair with the procedure, and removing the starter is just a waste of time and energyt
Another great point. There is in fact plenty of room to remove the plug and I did it yesterday three times without any problem. But the fourth time when I dropped the driver caused me a few anxious moments!