The first step is to remove the toilet and then the vanity if necessary. After that we remove those we usually get a better idea of the job at ahead. Next we will cut into the floor where is is soft.
Generally we cut a small hole into the floor so as to get a better idea of how big the rotten area is. We then keep cutting the bad areas out until we get all ot it. As a result we could only cut out a few square feet and then again it could require that we cut much of the entire floor out.
In addition to when we cut we are going down through all the subflooring and decking and eventually replacing all those boards as they contain rot and we want all the rot removed.