This guy can pull out chunks of hair like you can’t believe! And since John wouldn’t let me post the actual picture of the hair chunk I dislodged, I drew you one.
Unscrew one side and let some of the water drain out.
Once you’ve dumped the excess water, inspect your J bend and remove any clogs. Hook your J bend back up, making sure all of the pipes line back up. Run some water down the drain to test for any leaks. If something’s leaking, the pipes might not be lined up properly or fully tightened.