Sink is large, weighty and easily drops in to the original hole. The time of installation was to convert a double bowl stainless steel sink into a single bowl. There was a lot of rerouting of piping that went on underneath.  I was happy though bc the old plastic pipes stunk so bad I would have bought new ones anyway. The strainer is a perfect match. We used clear silicone where the sink came in contact with the cabinet. It comes with clips for underneath and the sink has partial holes (4) cutout under the back lip of the sink in case your sink is a 2 hole and you want to add a sprayer or soap dispenser.  Of this is going in an uncut countertop it comes with a paper template that you would be able to trace out the hole.