You can adjust most metal watch bracelets at home with a small set of tools — a spring bar tool or a thin punch, a soft surface to work on, and some patience — by removing links until the bracelet sits comfortably with just a little play, not tight and not loose enough to spin around your wrist.
Figuring out how many links to remove
Put the bracelet on and pull it snug, then note where it overlaps. Each link typically adds about a quarter inch, so count roughly how many links of overlap you're dealing with before you start removing anything. Take out one fewer link than your gut says at first — you can always remove another one, but putting a link back in after you've lost the pin is a much bigger hassle. The goal fit is loose enough to slide one finger underneath comfortably, not skin-tight.
Removing the links
Most bracelets use either friction pins or screws to hold links together. Friction-pin bracelets usually have a small arrow or dot on the underside of the link showing which direction to push the pin out — always push from the direction the arrow points, since pushing the wrong way can jam or damage the pin. Rest the bracelet on a block of wood or a folded towel with the link over a small gap, then use a spring bar tool or thin punch and a light tap to push the pin through. Screwed links are easier and less risky — just unscrew with the correct small screwdriver, remove the link, and reassemble. Take the links out symmetrically from both sides of the clasp when possible, so the clasp stays centered on your wrist rather than sitting off to one side.
Putting it back together
Reconnect the shortened bracelet by lining up the links and pushing the pin back through from the opposite side it came out, until it sits flush on both sides. If a pin doesn't want to seat fully, don't force it — double check the link is aligned correctly first. Keep the removed links in a small bag or box; resizing needs almost always go in the direction of removing more links over time as bracelets stretch slightly with wear, but it's still worth holding onto them in case you ever sell the watch or lend it to someone with a bigger wrist. If a bracelet feels intimidating to adjust yourself, most jewelers and watch shops will resize it for a small fee in a few minutes — there's no shame in leaving this one to someone with the right tools if you're not confident.