if i were you i'd carefully cut little holes at the bottom of those cups for drainage if you havent already. sometimes the roots will poke thru those holes, if that happens then you'll know when to transplant.. but its really not a huge issue. id transplant in a week regardless. as for transplanting... DONT WATER IT, let the soil dry out, then tip in upsidedown with your fingers supporting. in my experience that technique works, the soil might break apart a little bit but its fine, just get it in the new pot asap