This trek is probably the most beautiful trek we did in China. Don't hesitate, just do it; follow the trace... Attention: we just failed at finding a nice path to finish the trek, so don't follow our trace for the last descent to Repkong!!! For further detail on this trek, you can buy the following book (http://amzn.com/0898866626). That's what we did, the description is quite good and precise.