I want to replace the solid pipe connector from the water main to the toilet tank with a flexible hose. Is this something I can do myself (note: I have no plumbing experience), or do I need to pay a plumber to accomplish this task? It looks like a simple matter of unscrewing both nuts, removing the solid pipe, and then threading the hose's connecting nuts on. But I'm afraid to just jump in: how many times does "looks simple" turn into a nightmare? Any step-by-step advice on how to do this myself would be so appreciated.