Fantastic bow, and so nice to see bows from different cultures being made!
To string something like this, the knee-in-the-handle method works perfectly. Just lean the bow away from you, with the belly facing you. Put your knee smack in the middle of the handle and lean your entire body weight onto it. Pull the top limb towards you and brace it that way. It works up to about 140lb, so should be a piece of cake with this one (unless you weigh less than 100lb, in which case...
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If I remember correctly, many of these bows have the string stored by being wrapped around the handle and tied off, instead of being slid down the string. To brace them, you loop the bottom nock end on first, then do the knee method and bring the top loop up and over the top nock. This lets you build up those sinew wraps quite thick to add safety and security, because the string doesn't need to fit over them to slide down the limb.