The installation was easy, no need for a plumber if you're at all handy with tools.  Found that we also experience 2 problems as noted on other reviews.  1. Difficult to find the "sweet spot" to turn water off so that it doesn't leak.  2.  Rocks on the sink.  It appears that the wrong gasket was furnished with the faucet, won't snug down on the sink, rocks on the gasket.