You have a couple of options. First, you could cut the plant back very hard and remove most of the roots and repot; second, you could root a cutting (cut a piece off of your existing plant, put it in moist soil and you will have a new plant in no time) and then replace your plant with it; finally, you could plant it in your garden and cut it to the ground whenever it gets too big (my preferred method).

Thanks for the reply.

I have never trimmed or cut back roots before, so is there a proper way to do it. Do I use pruning shears and just make the root ball smaller all the way around ? or do I do it a different way ?