Pic from the tool on Amazon.

Hint: clean the hole of burrs, try to clean the inside of the tube around the hole as well, than add a little epoxy to the outside of the rivnut body before insertion. The hardened epoxy will help prevent the rivnut from spinning later, especially if you don't tighten/crush it enough.

And I guess a warning, just from the reviews of the same/similar tool on amazon, seems like maybe some folks try to overtighten the rivnut and wind up snapping the installation bolt.

I tried to upload the pdf instruction sheet for a similar tool, but I couldn't figure how to upload a .pdf. Maybe I can't? Screenshot it as a .jpg and upload? I found it through google, so you can, too.