The following is not meant to scare you at all, just to cover your basis in the "worst case scenario", planning is prevention! We have made moves to Shanghai, Cambodia, Santiago and soon Sao Paulo here is my list of things I do on scouting trips.
First make a list of all the things you need to do, then make appointments before you leave. This is going to be key to the success of your scouting trip.
Check out your healthcare options, what hospital you will go to in case of emergency? Visit the hospital and take a tour. Will they accept your insurance? Do you have to pay upfront then wait for the insurance company to pay you back? What does your insurance cover? What will happen if you have a major emergency and need to be media-vac'd? This happened to my husband last year, he ripped his ankle open and was in remote Patagonia and had to be helicoptered to Santiago for specialist surgery. I know the cost for the medivac was in the $USD20,000+ range plus the surgery and hospital costs, this was 100% covered by our insurance, I think the end bill was somewhere around $USD60,000. Do you require any specific medications? If so, is it available and at what cost?
Do you want to use public transport? Is it safe? If so, use it during your visit so you are familiar. What is the safest taxi company to use? If you get a car how do your get a licence? What does your insurance cover?
RE: Housing, visit the houses/apartments you might consider. How is security? How physically safe is the house? Will it hold up in an earthquake? How is the water pressure? What bills do you need to pay on top of the rent? Make sure your rental contract is a good contract, many landlords will try and screw foreigners over just because we don't always know the rules. If pollution is a problem can you buy air filters to cut it down inside your house?
Go the the area you will live and see how close the supermarkets are? Are there outdoor places for your kids to play in?
Go and visit the schools (make an appointment before you leave), sometimes a school seems great online but is totally different when you actually walk through, also make sure they have space. It is also easier to try and prepare children for a new international school if you can say "Hey remember when we met Mrs Smith who will be your new teachers? Wasn't she nice?" or "Hey your new school had a pool, cricket field etc., you must be excited for that!"
Are you taking your goods/furniture with you? If so does your shipping company have experience with the destination country? Are their applicable taxes on imports? What happens if the container is stuck in port? Who pays the fees? If you plan on shipping goods go and talk to the receiving company during your visit, and make sure they know what they are doing.
Check out internations.org www.internations.org/nepal-expats
It is free and we use the Santiago version, it is really helpful.
Good luck with your trip, have a great time!