Create a checklist of things to pack, bring or prepare. Helps to know you definitely packed 3 sets of clothes and have your passport ready.
Keep all your paperwork in a file easily accessible. Try to print stuff if you can because that doesn’t run out of battery.
If you’re the type to fret over prices, have a currency exchange rate ready so you know how much things will cost in your currency. Just a good mental shorthand reference. Have it be what you exchanged it for at the time not whatever the current rate is.
Isn’t this the basis of zomb100? Where his work life was so shit that when a literal zombie apocalypse happened he finally started living the life he wanted. And it wasn’t that he dreamt of survival and shooting dead people, just a bucket list of cool things to do.
Anyway, I can relate.