You can pull the side panels off, which gives you access to some of the screws. Grab the side panel where I have my hand and pull straight back. The panel will pop off.
One of the service techs told me that you have to remove the seats to remove the center console, but I've seen photos where the...
Take your mileage per day and divide by your efficiency: 100 miles per day / 3 miles per kilowatt hour = 33 kWh per day (I'm using 3 miles/kWh, what you get will depend on how you drive). Your electricity bill will go up by approximately 33 kWh x your electricity rate (per day).
On the Tesla forums they say that it takes three to four months if you mail in your application. However, those who apply on the website are getting approved in about a week.