I bought my step plates from Jim Carter's, but the template was hard to follow. Don't laugh or scorn me, but this is how I installed mine.
I lined up the plates on the running boards very carefully in the position that I wanted, then I stepped on them
Then when I pulled them off, the studs on the step plates left a nice mark for me to drill into, and they lined up perfect the very first time. Afterwards, I sprayed some undercoating on the underside of the board so the nice new shiney bolts would not rust. Also, you could put a dab of "white out" on the studs so that you won't take the risk of bending one of the studs if you stand on the step plate.
These step plates are one of the best things I have done for my truck.
Take care!!