I'm looking to take delivery of my 3 in about a month and want to have my charging setup ready. In my 2 years of anticipation waiting for this car, I already had an electrician install wiring terminated to a NEMA 14-50. But I was foolish and didn't consider that I might be plugging and unplugging this in the rain, because the charger is in an outdoor location. I have decided to go for the HPWC, and now I'm wondering when is a good time to have the electrician come swap out the 14-50 to the HPWC. Should it be done before or after I have the car? I want to have it done as soon as possible so its ready, but I'm wary that I can't test that the HPWC will be functional and installed correctly until I have the car to try charging with it. Is this something that can normally go wrong, or is swapping the outlet from the 14-50 to the HPWC pretty straightforward and I should just have it done before my delivery? Note I also have not tried whether the 14-50 is functional (I was told it is, but have never used it).