I don't know how.

I've got dealing with conventional car dealers down to an art form, and it still isn't even remotely comparable.

To get a Tesla you order it online and then go in for an appointment to pick it up. Hand them the payment, they already have all the paperwork ready for signatures, they give you the key cards and offer to help you install the app. You accept delivery and drive home. If you want, you can easily be in and out in 15 minutes or less. And the delivery guy doesn't try to sell me anything. No extended warranty, nothing.