It is normally fairly simple to take links out of a watch. You will need to make sure to take an even number out on each side of the clasp if possible so that you maintain uniformity on the band and the face remains centered. You should place the watch face down on a soft surface and then look to see if the pins holding in the link are flat at the top or have a screw head. If they are flat then you should take a sharp instrument and a small hammer and knock out the pins. If they have a screw head then you will need a very small screwdriver to remove them.
If your watch doesn't have link attachments, it can be confusing how to take links out of your watch. It's quite simple and all you will need to do this is: a flat head screwdriver and a needle nose pliers. You can find more information here: http://www.schlatter.org/watchband.htm