That pot might be a little small. Get a 5 gallon bucket. Water the plant and completely soak the soil. If the soil is wet, its much easier to take out as a whole. Turn the plant upside down, and take the entire thing out and into the next pot. Then sprinkle soil around and on top up to the first leaves. The big pot or bucket should be good for the rest of its life, because now your going to start worrying about flowering rather then root and leaf growth.