How Do I Obtain a Power of Attorney for Document Legalization in Thailand?

It's easy. It is a form that your Thai friends can pick up for you. You fill it out and sign it, and you thereby transfer to your friend the power to do what you want them to do for you (and they can't do it without that paper).

A Thai friend of mine is selling my in-Thailand car for me. She asked me to create for her a Power of Attorney that authorizes her to act on my behalf. Then she found the buyer, negotiated the price, wrote up a buy/sell contract with them... And all I have to do is wait for the money to appear on Sept 1 or so, and if it does not, we get to repossess the car. But none of that happens without the Power of Attorney letter that allowed her to get started. I think every experienced Thai business person knows this, so it should not be hard to find the form.

Down load the document and have your partner sign it in a lawyers office, who will witness it. I would suggest using a limited power of attorney.