The first tip is lining up. Many parts of the journey that requires travelers to lining up. To avoid long lines, go on the counter the leftmost and the most far away from the entrance.
For the majority of tourists are users right hand that has the right direction preference while lining up.
Furthermore, to make the holidays happier, let's turn off the phone and focus on the location you are. It will make the body and mind more quiet and out of the circle of angst.
Accommodation options are also important. Look for comfortable accommodation just like your own home, and bring a favorite objects. E.g. cups, pillowcases, blankets, or family photos that make you calmer and happier.