3.Be prepared to call
Sometimes drivers like to call you before the start driving towards your location. Since Uber will show your home number, no driver is going to make an international call. So if you don't see the driver moving on the map for 2 minutes, call him up and tell him you're waiting for him.
4.Keep an open eye for offers
Keep an eye on the app notifications, google for offers or even talk to the drivers to check there is a promotion going on. In my case it was my Uber driver who told me the coupon code, no points for guessing how much I rated him.
I hope this will make up for a fun holiday without horrors of haggling.