/ Them there himalaya's
deoends what you mean by 'tibet'. its a huge place and not easy to get about. if youre talkin lhasa - its a long way to the himalayas. if youre talkin zhangmu or somewhere along the highway but up on the plateau its rife with redtape, so best check what access you will have before committing.
either way, you wont get out of the gear conundrum as you will need to be totally self-sustained. october wont be the warmest time of year.
if youre talkin elsewhere in 'tibetAN' areas of nepal, sikkim etc (ie south side) you will have better conditons.
as for prep - long, hard cardio stuff with weight that increases your efficiency. a lot of leg work and 'pack carrying muscles'. perfect pissing into a bottle.
I heartily recommend a really comfy mat.
I am a huge fan of the Exped Down Mat. It costs a FORTUNE, but is very very warm and very very comfortable.
If you are sleeping on the ground for any length of time, this will make a big difference.
And it will be really good for wild camping in the UK too.
As for prep, cardio, cardio, cardio.
It is not just about being able to do a big day. You want to be able to do a big day after you have already done three big days, and still be able to do another big day tomorrow.
I would also recommend you try to get as many multi-day walks done beforehand. Walks where you are camping. You want your camp craft to be slick. You want to be really really comfortable about living in a tent.
For info, I recommend Medex. Read their free book. Take it with you. Learn about altitude.
I also suggest a small first aid book, plus a set of medicines.
http://www.amazon.co.uk/dp/1852847158/ref=asc_df_185284715811831725?smid=A3P5ROKL5A1OLE&tag=hydr... is a good one.
Above all, be flexible, look for the moments of beauty and joy, and have a great time :)
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