I watched the video on Dawson's web site on fitting and installing the sights, and did it my self. I already had a good vise, soft jaws,dial calipers, files, stones and loctite 620. If you plan on having multiple guns 3-4 it's worth the investment if not your better off paying someone. Either way the sights will need to be fitted, they will not just go on with a sight tool.