We should make a pre-tuning guide covering things to inspect on your car, updating software/AP etc. Here's a half-assed outline/idea
If you're starting with a car that is in one of our specific staged configurations, download that map off of our website, or by copying it off of the Accessport.
If however your car isn't close to one of our maps you'll want to start with the map closest to what you have on the car as that will require the least tweaking to get your car in a driveable state.