I bought a fine watch and didn't want to scratch or damage the brazalete.  Also didn't wanted to take it to a jeweler for him to damage the band or return because it was not as comfortable as I thought when the work was done.  So I did it for myself, twice since the first time it felt well but as I wore the watch it felt a little tight.
It's not that easy to keep the watch in place while removing the pins but beside this it works as intended and the sizing is easy enough to do it even more than once if you're not happy with the first fit.