That's a bit steep, but, like everything, "It Depends".
In my case the install was $1000; but the house breaker panel is in the attached garage, it's 200A service, so had plenty of spare capacity, and the routing was up from the top of the breaker panel, into the attic above the garage, over to between where the garage doors are, and straight down to the location of the wall connector. In other words, short.
If you need new service (because you don't have enough spare capacity), or you have to go through five concrete walls, and the garage is on the far side of where the wall connector lives, then, yeah, money.
Pretty much any licensed electrician can do the work. The advantage of the Tesla recommended ones is that they (get this) take pictures of their work as they go, and said pictures end up on Tesla's web site. Where, presumably, a help desk technician can look at them and make sure that all the wires and/or switches were wired/bolted down/set correctly.
Do the usual: find three licensed electricians and get estimates. Good luck!