RIA sights are not Novak cut. The Rock Island dovetail is Novak-ish, but different in a few key dimensions.
LPA and Dawson both make sights for Armscor/Rock Island dovetails.
You should not be intimidated by installing sights. It's sliding a dovetail into another dovetail. If you played with Lego or K'nex or Erector Sets or Lincoln Logs as a kid, you have the mechanical aptitude to install a set of sights. A sight pusher tool (one that cradles the slide and allows you to push sights in and out by rotating a threaded rod) is worth it, 100%.
Most sights will need a smidge of love with a triangle file, but sometimes the stars align and the as-manufactured replacement sight will slide into the dovetail about 1/3-1/2 of the way with finger pressure. If it will do that, lubricate, go slow, and install with the pusher. Take care not to push on the blade of the front sight. Center the front sight and zero for windage (using the pusher at the range) at the rear.