I used this £3.99 tool amzn.to/48wJDC0to adjust your watch bracelet. It might not be the best but it was very cheap and did the job.
For links with round or flat pins, just push out the connecting pins with a tack or removal tool. Then, remove the links and reinstall the pins to lock them in place.
. You want a little breathing room on your wrist, so measure the exact size of your wrist then leave at least 1 extra link in.
To measure:
Position the watch on your wrist exactly the way you intend to wear it.
When you are satisfied with the way it is positioned, turn your wrist over so that the watch band clasp side is facing up.
Gather the slack in the band and hold the links together to simulate them being removed. Stop gathering the links up when the watch band fits your wrist just the way you like.
The number of loose links tells you how many links to take out.