Mikes response was right on. The only thing I would add is that I bought a pressure bleeder mail order from an ad in the Star magazine. It has a hand pump, a pressure guage, a vessel and an adapter for the MB master cylinder cap.
With this gizmo, you fill it with brake fluid, connect it to the master cylinder and pump it up. It maintains pressure AND it supplies fresh fluid as you bleed. This way you don't have to worry about letting the reservoir get low.
As Mike said, it's good to get a head start by emptying as much of the nasty stuff out of the reservoir before beginning the procedure.
My gizmo works great and I don't have to enlist help. Now that my son is off to college and my daughter has discovered boys and working and, of course, my wife never seems to be available to help with this chore, my one man solution is very convenient.
I can't remember the name of the gizmo, but it cost about $55 and was worth every penney. It is advertised in the Star.