It's pretty easy.
You can go in prepared using the online forms that allow you to type in the statement (in my case it is legible then) remember to go in with the right attitude and an appointment, and expect to have to drag the bike there 7 times. Then when it only takes 3, you'll be happy.
Know where the VIN/engine numbers are and they're clean legible (white grease pencil smeared into the stamping works well) and if it isn't obviously from a long time ago (like how some cruisers could be 3-40 years old) take along some way to show that it is vintage.
Some local PD's do inspections so you can go in prepared.
EDIT - Mileage: I'm happy to argue that for a bike that is this old, how can the mileage be real?