The seats are like $349 at the local Costco. It doesn't involve removing the toilet, just replacing the seat (two hand tightened nuts) and adding a T connector

The seats are like $349 at the local Costco. It doesn't involve removing the toilet, just replacing the seat (two hand tightened nuts) and adding a T connector to the cold water line so that both the toilet and seat have water. None of those things are permanent and can be done by a single person with minimal knowledge and some common hand tools.