My husband and I bought a few houseplants in March that are good for low light spaces. One of the plants that we bought was a peace lily. In the 3 inches we have had the plant it has tripled in size. It is starting to look pretty out of control, like we live in the jungle. I know that to trim the tips of the leafs but I don't know how to trim or prune the plant back so that it regains a nice shape. I'm afraid that if I just start cutting the longer stalks off that I will hurt the plant. I've tried searching the internet but can only find how to trim the tips of the leafs. Any advice on how to properly prune and shape a peace lily?