Darren, you are a lucky so-and-so. My partner and I were in the Himalaya and Hindu Kush earlier this year. It's a wonderful, magical place with the most incredible people. Apart from the stated well broken-in boots and a good sleeping bag you will need a good kip-mat.The best advice I can give is that you research the people of the area you are going to, and try to learn a little of the language. No-one out there does not know the meaning of "Hello", but a warm "Salaam Alekuum" will open far more doors to you and be greeted with warmer smiles. (Assuming they speak Urdu of course!) Second is that you take LOTS of medication for gyppy tummy. It can go either way so take stoppers and goers. Rehydration salts are a good idea too.Take a Sigg water bottle and fill it only from purchased SEALED bottles of water. If you have the chance, chill it overnight in the Sigg, coz it will be hot during the day and you'll be glad of a cold drink you can trust. You will need plenty of sun cream too, not only will it be hot, the sun is more fierce at altitude. Unless you are happy doing things "the arab way" take some loo roll, it doesn't exist outside the hotels more used to westerners. Be ready to eat the local food (even if you have seen the way the meat is butchered!) and enjoy the green tea (Lovely stuff!) PM me if you want more in-depth info. A Swiss Army Knife like the Ranger will prove invaluable, even if only for opening bottles of Pepsi. Take one you don't mind coming home without, you'll find there are plenty of folks you will be glad to leave it with as a gift when you leave. (Mine is doing the rounds in a jeep somewhere in the NW Frontier Province these days) The same applies to most of your kit really. There will be people who can really use whatever you can leave behind, sleeping bag, kip mat, fleece top, anything. Oh, and don't rely on a jet flame lighter above 10,000 feet, they don't like it up there. An ordinary disposable lighter or matches might not be as efficient in the wind, but at least they'll light.
Truth is, I'm really jealous of you being able to make the trip, and I'll help where I can.