I am horrible at haggling.
It’s true. The rule of thumb in Guatemala, if the guidebooks have it right, is: Ask a price, offer something at half that amount, wait to hear what they offer in return, go from there, and be gracious, always realizing that the goods in the markets are often those the merchant or her family has made, and from which they make their livelihood.
It also assumes one has basic math skills. And can figure out the exchange rate of Quetzals to dollars (about 8:1, or 6:1 after you get ripped off by the airport currency exchange), AND isn’t trying to think through all this while translating the conversation from Spanish to English for the benefit of her ten year old.