Heading off to Nepal is NOT like heading off to Europe. Nepal is very welcoming to visitors, but there's a bit of planning involved!
If you are flying directly into Nepal, then you've got half the battle done! This is an easy way to enter the country, although the STEEP descent into Kathmandu can be a little unnerving!
If you're heading there from Inida, you have a few options to think about. The easy way is to fly from either Varanassi or Delhi. The flight from Delhi is about $150US one way, from Varanassi about $75Us one way. If you like your comfort or are on a schedule, this is THE way to go.
Not having been on a schedule we choose the butt numbing 2 day bus ride from Varanassi. This is fun, and only costs about $15, the scenery is great, and I would reccommend everyone do it...ONCE. We did fly back to Delhi, to do this trip twice is masochistic!
Nepal requires a VISA but you can get one at the airport or the border upon entry. You need 2 passport photos and somewhere between $30 and $50 US, cash only. The reason for this discrepancy is the mood of the guards seems to dictate the price! I got held at gunpoint at the border because our kids were included on our passports and they couldn't understand this, the guard was NOT in a good mood ! I finally managed to convince him,, but it cost me a few $ extra.
There are some medical concerns , be sure to check with a good travelers clinic well before heading off. we had tetanus, polio, hepatitis, typhoid and menengitis vaccinations. Most of Nepal is too high for mosquitos to live, so unless you're heading to the lowlands (the terai) then malaria medication is unneccesary. We packed syringes, just in case, as hospital cleanliness is less than good. Another thing to remember is that if you are heading on a trek, read up on Altitude Sickness, you don't have to be heading to the peak of Everest to experience symptoms! know what the signs are, head them, and watch your daily ascent/descent rate.
Nepal is poor, so don't expect luxury, but the people are WONDERFUL and will make your heart sing! (REALLY ) The scenery is THE BEST IN THE WORLD, so bring lots of film, and enjoy!