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My Nepal trip was in Dec 2007. Went to Kathmandu for 3 days to secure a guide before heading to Pokkhara by flight and then into Annapurna region. I didn't head up Annapurna by to Poon Hill (3210m). 2 days of 60 degree slopes uphill and 2 days down. Afterwhich, I went back to Kathmandu by bus (8hr + traffic jam).
Nepalese Rupee can be exchanged at the airport (kill throat) or at your hotel. Importantly book your hotel from Singapore before going. Ask your hotel to introduce a reliable guide. They will charge everything in US$. My trip up Poon Hill was about US$640 (including the flight). All makan and housing paid by guide to their locals. Makan is not a problem up in the hills. I was eating fried rice with my extra sunny-side up and Masala tea (must try). You can get pizza, spegetti up in the hills. Only thing is, it is more expensive as you ascend.
Do get a jab before leaving. I forgot that during my trip but I was very careful not to even sip the tap water while brushing my teeth. Hotels there can be trusted to take care of your main luggage for the few days you go up hiking. Of course you have to return and stay there towards the end of your trip. Try getting a 4star and above hotel while in Thamel (Kathmandu).
Winter starts in December. It is also climbing season. No one climbs in June as the rains brings out leeches also. Temperature ranges but while you are climbing up, you need a long sleeve and a thin fleece. Fleece can be bought from Kathmandu like any other hiking equipment for S$5. No you didn't read wrongly. It is S$5. It get really freezing at night (in the hills) to sub 0. So you will need down jackets to survive. Pants wise, get a good pair of running tights under your jeans. Nobody ever bathes up in the hill. You'll be a hero if you do.
Training for the trip is simple. Some light jogging and climbing will do. The guides will stop and wait while you pant for breadth.
Hope those info is sufficient. If you want to ask for more info, message me in multiply.com
I don't CS that frequently. Anyway I'm planning to go there again in June.
Nick