Here is how to resize a metal watch band. When you buy a watch with a metal band, you will probably need to remove a link or two for it to fit properly around your wrist. This video shows you how to resize and adjust a metal watch band. The resizing links are marked with arrows. Push the pin out of the resizing link in the direction of the arrow with a paper clip to remove the link. Remove the proper number of links for the watch to fit on your wrist, and you have learned how to resize and adjust your metal watch band.
If you need watch repair tools, this kit is affordable and has all the tools:
https://amzn.to/2W5eORX
Here is where to get the watch I resized the band in in the video:
https://amzn.to/2X4Fbbg