I have a lavatory sink with Kohler widespread "Revival" faucets in a house that I have recently bought.

The hot water faucet is gradually getting very hard to turn on and off.

I would usually take the faucet apart but I cannot see any way to remove the handle or disassemble it.

Is it all one piece and I have to get it from under the sink or what?

It is a very expensive set and I do not want to ruin it.