I've installed running boards - but it was some time ago.
The ease or difficulty of installation will depend largely on what kind of SUV you have, and what kind of running boards you're wanting to install. And sorry to disappoint, but it's not
quite easy enough for a cave man to do.
If you're going to use them to step on, make sure you get the running boards that attach to the frame, not just to the lip of the body panels.