rotate them out. pull the two outer frames, which should be honey, move the frames that are next to them out to replace them. keep moving the frames till you get to the middle and put two new frames there with 1 or 2 frame of brood between them. Once the bees fill out the empty frames, do it again.
If you're using all mediums, put empty a couple empty mediums on the bottom and the bees will move down by themselves and start storing honey into the old frames once the brood emerges. Once the brood is gone and the queen is in the bottom of the hive laying eggs, you can pull them all at once and replace.