Good bargaining is a friendly game, not a battle, and sellers respect buyers who play it well. Start by browsing without visible enthusiasm; falling in love with an item openly weakens your position. Ask the price, look mildly surprised, and counter meaningfully below it.
Techniques that work everywhere: learn the numbers in the local language, compare prices at two or three stalls before buying, bundle items for a package discount, carry small notes so change is not an excuse, and use the walk-away, which often produces the real final price at your back. Stay smiling throughout; humor closes deals better than aggression.
And keep perspective. Grinding a vendor down over an amount that is trivial to you but meaningful to them sours the exchange. A fair price where both sides feel fine is the actual win.