Altitude Sickness: As you would be staying over 15000 feet for the most part, you might experience symptoms and discomfort of altitude sickness (headache, loss of appetite, nausea, exhaustion, sleeplessness, breathlessness etc.) until your body adjusts to the elevation. This can take a couple of days, depending on your body capacity. It is mandatory to acclimatize properly before moving on to the higher altitudes. Drink plenty of water, be calm, and do not exercise.
Currency: Only Chinese currency, Yuan is accepted here. Exchange are available on USD's only. Though, I would suggest getting the money exchanged in Kyerong (1st stop after entering China) as the rates are better
Hiring of Porter & Pony: Now here is a catch. During Parikrama hiring of pony or porter is available but the pony will only carry the pilgrim and not ANY luggage. A porter needs to be engaged to carry luggage. Also, please note that the luggage should weigh less than 5 Kgs. Carry only necessary stuff during Parikrama. You would not change anyway. To hire both, you will have to pay 5000-6000 yuan. Also, the hiring of them is not a part of any package and would need to be booked at the spot. Once booked, pony or porter cannot be cancelled and there will be no refund.