I'm doing the same thing, pretty much exactly, because I'm not digging the bucket method and can't use a lot of soil due to allergies. I would've done it already but I'm a little apprehensive because my rootballs are still surrounded with 16oz. worth of soil. What I've read, and I'll state that right up front, is to gently wash the roots off in a bath (don't know what pH for the water or if it even matters) of room temp water and then gently water the roots into the pots.