X2... if the master was already on the car & working, there is no need to bleed it as if it were new/dry.
As mentioned pinch the lines when changing out the wheel cylinders then replace the rubber lines as fast as possible or figure out how to plug the metal line while doing that, in order to keep the master full.
If it needs to be bled on the car you can do the same procedure as if on the bench... run lines from the outlets back into the master, i use some cut off metal lines from a junkyard car bent back into the master, then just pump the pedal a bunch of times until no bubbles come out... can take like 50 pumps when its completely dry/new.
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