I think a lot of the talk of making sure it's an electrician experienced with EV charger installs comes from a) some chargers being much more complicated that the Tesla Wall Charger, which is just another 3 phase appliance, and b) lots of promotion by overpriced installers on this point!
I've done way more research into EV chargers than I'm comfortable. In my case, originally I was going to go with a Zappi style unit, and that, yes I would want someone with experience because there is a lot more complexity in the design and installation. For me I have a powerwall which has lots of CT Clamps, rather large solar install that even more CT clamps, then the Zappi would have been more complex again. So I've elected to go for the Wall Connector instead, keep it simple then integrate it into the powerwall to intercept the excess solar going to the grid.
In summary, you want a good electrician, but that applies regardless of the work they are doing, but the installer's manual is pretty clear, any sparky can do it.
My friend is a sparky and will be looking at my install over the weekend, will be interesting to see what the real price is without all the EV charger inflation!
Edit: Sorry my answer doesn't qualify as simple and dumbed down, not my area of expertise