Help needed -toilet flange
This house is nearly 100 y.o., we bought it about six years ago
I wanted to swap the second floor toilet but ran into a problem with the flange.
It is secured by four 4" screws and one 5" screw straight down into some nubs of pretty rotten wood. (wish I could get photos beneath the flange). The wood nubs broke away pretty easily when I poked at them with a screwdriver. The next surface is about 11" below the floor.
I have never removed a pvc flange, scared I will damage the pipe (also pvc). I am guessing the flange will need to be removed and the floor beneath built up? Out of my lane here.
I know the photos don't give a lot to go on, should I anticipate contacting a plumber first and possibly another tradesman to deal with the rotted wood beneath?