Here are some things I wish I knew before getting to Kathmandu
In the airport: There are 3 counters you must go to before you gon through customs. One is to get your embarkation card. Everyone flocks to this because it's first. Get to the visa computer kiosks as soon as you can because they take the longest. Then go to the bank and pay for your visa. KEEP THE VISA RECEIPT handy. I stuffed mine away without a second thought and had to get out of line to look for it. By now you can get an embarktion slip and fill it in while you stand in line.
My raincoat is the most useful thing I own. It's May and it poUrsula.
Roughly to figure out what the NRS are to the US dollar take the decimal point and slide it 2 places to the left ex. 1000 NRS is equal to 10. Dollars
Cash is king here but there are plenty of ATMS around but be sure you arrive with a big chunk of cash