Gently pull the nut down.
Toilet lock nut clockwise.
Using various methods to remove the nuts and the bolts when the toilet bolt won t tighten gets your project back on track.
If the nuts don t have wings lock a pair of locking pliers around each one in turn.
The end of the water supply line will come away from the connection.
Tightly secure the lock nut washer and nut.
When you unscrew the screw the pliers will hit against the toilet bowl and prevent the nut from turning and it will loosen.
Use a pair of pliers to just loosen the coupling nut.
Then finish loosening the nut with your fingers.
Empty the bucket and place it underneath the water supply line.
Locate the coupling nut on the underside of the toilet tank.
Remove the fill valve.
Prepare the toilet turn the water supply shutoff valve clockwise to turn.
Raise the pipeline from the overflow tube.
Position the new valve in place of the faulty one.
These are used in a toilet chiefly to secure the fill valve in the toilet tank.
The valve is connected to a rubber ball float.
Use your pliers to loosen the nut under the tank.
While turning these stabilize the bolt from above with a screwdriver.
I then would proceed counter clockwise with a second offset 6 pipe wrench and try to loosen the nut.
Remove the nut washer and lock nut.
To be honest before i grabbed the hack saw i would always set up a straight 6 pipe wrench inside the toilet tank and position it at the base of the fill valve with the handle up against the toilet tank.
Some nuts have wings that you can grasp with your fingers.