But… can a non licensed electrician do a hardwire himself? Would it be significantly cheaper to do a hardwire install by an electrician?
Absolutely. The wiring for this is no harder than that for a new stove. If you are comfortable installing breakers in a breaker-box, running "big" romex-style copper from the breaker to your install site, are familiar with local code regarding the size of the wire / allowable height of the outlet / etc. and interpreting the instructions provided with the charger, you can do this. I wouldn't recommend it as a first effort in home wiring for anyone, but the circuit itself is simple- just run the cable from the breaker to the charger and make the right connections there. So if you're comfortable with the things above, you can do it, and save yourself a lot of money. And if you have to, spend $10 of what you plan to save on an illustrated "Complete Guide to Home Wiring". As others have said taking it off the wall is super simple. Turn off the breaker, disconnect the wires at the charger, and take the charger with you.