Not hard to install at all considering we were replacing a similar type of level handle.  We took off the old one and pretty much just followed the visual instructions on where/how things went, screwed them in, and it was done.  Has a very nice feel.  Looks beautiful.  I like the tension on it.  Only problem with a level handle:  your cats can learn how to use them and get into the room.  But that's a small price to pay for a new handle to make our door look spiffy again.