Six years ago my wife and I built a house and when we had the basement poured we had the plumbers install all the pipeworks and drains for putting in a bathroom down in the basement. They did so and covered the drains. Now I am ready to put in the bathroom and would like to open the drains and install a shower. How difficult is this and can you give advice on any prep that needs to be done. I am just installing a shower stall so I would like to do it myself if possible. Can I get a little direction?