it depends on what you are using. The safest way is to get some tubing to attach to the bleeder screw end. Fish tank air line works really well, especially the softer more flexible stuff. You also want a jar I find a large CLEAN Ragu jar work well.
Fill the jar with at least an inch or two of brake fluid. The end of the hose needs to be covered.
When I did mine I had my wife push on the pedal, not too hard, then opened the screw. She would tell me when the pedal got down to the 3/4, or the master cylinder dropped past the Min line.then I would tighten the screw and she would let up on the pedal. She would fill the master to the max line and we would repeat.
It is Very Important to keep the Master Cylinder full enough that is the big mistake I s most people make, especially if they are soloing it.
We continued this until no bubbles came out.
if you go all the way to the floor, you will lose pressure.
The reason for the jar is just in case the assistant slips on the pedal and lets up, it won't suck up air. it the Chilton method it is required because they are loosening the screw with no pressure behind it.