How much cfm/psi do I need for changing tires?

I'm looking to get a good generator/air compressor for the shop. I will be changing some tires and need to know what the minimum cfm/psi is to get the tires to bead on the rims without too much wrestling.How much cfm/psi do I need for changing tires?that depends on the tire i have seen some that dont seat until they reach 50 psi but it depends on the tire. how do you intend to inflate the tire if you are only using a hose that could be hard.