I placed my order on 6/28/18 at 12:15 AM PST for a Model 3 Dual Motor and have a delivery estimate between Sep '18 and Nov '18. I have completed all of the steps under "Complete the steps below to take delivery" except for "Payment Method" because I have not decided whether I wish to pay with "Cash" or "Finance through my own bank or credit union" so I have not selected that yet. Since my delivery won't happen until Sep-Nov, I have a minimum of 2-3 months to decide. QUESTIONS: 1. If I make a selection for "Payment Method", would I be allowed to change my selection online without contacting a delivery specialist to do it manually? 2. Will not selecting "Payment Method" until I get closer to my estimated delivery timeframe prevent or delay my VIN assignment/delivery date? Thanks!