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I used to have one on my truck but had it removed as I don't like the look of them.
It's pretty basic installation- mine was held on with sheet metal screws.
What I would recommend you do is get 2 friends to hold it in place while you mark the mounting holes. Then you can drill pilot holes for the sheet metal screws which will make actually mounting the visor much easier.
That's pretty much it.
Oh, I almost forgot. Mine also had some kind of adhesive/sealer residue around the edges of the visor where it was contacting the cab. This is probably a good idea to keep water from getting in around the screws and eventually rusting things out. I would also apply sealer around the top of each screw once it has been installed.