Yup, I've done it may times. The root structure is actually similar to that of a daylily in some ways, and to a dahlia in some ways. What I've done is just carefully removed from the soil, shake off as much soil as possible, and try to gently tease them apart the way one would snarled hair or tangled rope or something -- slowly, carefully, and with a minimum of force. You probably won't really need to cut anything, but might want a sharp knife on hand just in case.

The good news is, if you break off little tuberous roots/tubers/whatever-the-heck-they-are, they quite often will regrow from the far end (end away from the original plant).

Really, if you had a nice healthy clump in a 10 inch/3 gallon sized pot last year, you probably could divide into as many as 3 or 4 pieces -- they grow quickly if given fresh soil and space.

I CAN guarantee you that you won't hurt it -- they're pretty tough, actually.

Thanks for the advice...I'll give it a try!