I am from Nepal. Don't know much about tourists though. Tourism industry is a rookie business here. I read in some blog some guy going on and on about what he hated about nepal which was about everything. So, it will be a good idea to do a good research since you are planning a long trip. There are plenty of websites run by different private tourism business holders you can simply google and find. The country is poor and just crawling to globalisation. So, you can trust any website with decent look and fair amount of activity. Noone will keep a fraudulent website here. And the country is so small that anyone trying to damage the industry would be immediately caught by the industry syndicate.The government website for tourism is
Some international embassies have warnings issued against visiting Nepal. that is a total crap. even during the civil war, tourists were very safe here. so, warning people now is just hippocracy. there are quite a few strikes which caused troubles in the past.but they donot affect tourists anymore. so, you will actually be in luck if there are strikes when u visit coz u will have pollution free quiet roads.
You mention end of the year. not quite sure about that. the best times are of course from september to march minus mid november to mid january if you dont like cold coz you wont find decent heating everywhere. if you came in october, u could enjoy a lot of festive season. you will love the people here. thats a guarantee. there are packages for those interested in culture specially. you can also stay as paying guests in many rural areas with families to know them better (official services). there are trekking routes. there will be a crowd of tourists around the most recommended places of the country. there are also routes which will seem very promising maybe to you but noone will take you there.
the biggest problem might be getting good guides.
you will most certainly love to trek around mt everest base.
there are a lot of cultural sites in and around the capital.
if you have been to african wild safari, u mightnot care, but you can go elephant safari in :"chitwan national park".
almost every tourist goes to the city of "pokhara".you had better go to "mustang(place not vehicle)" from there. thats nepal but landscape and people tibetan.
Although, tourists are charged almost double in tickets, its still very cheap.
You will find better contacts and info and can finalize everything from tourist sites in nepal.
But, if you ever get stuck, but want to talk more specifically, or maybe want me to find info for me, mail me without hesitation. i will be happy to help without hesitation.
i have to say perhaps the most u will miss is not having good/any sites that offer you nepalese language lessons/translation..
i just wanted to write this so that in case noone else responds u wont be put off.
sorry i could not be better help. good luck.