A biggie is having an electric outlet near to the toilet for the electricity the bidet seat will need (I so love my TOTO washlett, it rocks!) Also think about if you want a stand (movable) for the bidet remote, and if you want to start out with it wall mounted instead. From what I know, you don't want the type of controls that are seat mounted. Get the toilet elevated—so much easier! And you also don't want to be reaching around for tp...