I like to water my plants a little before transplanting, kinda helps hold the soil together, i then place the stem between my fingers and turn the pot upside down, lightly tap on the bottom of the pot and try to spin the pot, once it is loose go ahead and lift the pot off. Place the root ball into your 3 gallon pots and fill with soil until its full. Make sure to have your 3 gallon pots ready before you try to remove the plant from the old pots