It's no big deal to have a separate one for each and it's much better from a chemical hygiene standpoint. I have three 1L beakers and three 100ml graduates. Each is labeled with what goes in it so there's much less chance of using, say, the developer beaker to make fix and then using it for developer. When I develop film, I have all the chemicals mixed in their own beaker and ready to use before I pour in the developer. This way, I can just pour the used whichever back into its beaker and clean up afterwards and concentrate on the agitation and timing. I think this method cuts down on the likelihood of putting them in in the wrong order as each beaker is clearly marked.