...a plan. You'll have to shut the water off to the tank, drain what's in there now (flush, then use a bucket below or sop it out with a big sponge). Whatever new rig you buy should have instructions, or find internet instructions like these. Maybe an hour's work, tops. Advice: do not overtighten connections--you can stress/crack stuff. Finger tight, then a little more with pliers or a wrench.