I think it depends on the level of 'sophistication' one wants in their playing ... If one is familiar with the styles, and just wants to 'play', then it shouldn't be all that difficult ... It's when players are modifying styles to fit certain songs that it becomes more of a painstaking process ... JMHO
Spot on Tony,
one doesn’t have to have registrations or song lists , but facility is there for those who want it.