It might help if you'd post some pictures. Sight unseen, it's a bit difficult to make suggestions, but understand that the boxes are only for convenience. Each washer needs hot water and cold water faucets and a 2" drain that has a P trap, vent, and a connection to a sewage line. The vent and sewage line connection can be a problem especially for a novice. While it's not exactly brain surgery, it is a bit more involved that just gluing PVC pipe together. You can find photos and discussions on washer installations on this forum, but connect the drain to the sewer may be a problem for you.