A Quick Tip, Volume 1...

Always be prepared to roll with the changes. Clients can be very fickle. VERY fickle. You need to be ready to do something they originally asked for in your estimate/quote, then asked to scratch from the shoot, then asked to add back in, then modified, then scratched from the shoot schedule due to time constraints and finally added back in... about an hour before the shoot started. They are very fickle.