There are measurements/instructions to install them. It's not rocket science but good to know the "correct" placement.
I installed them on my 4.3. The installation instructions for the 4.4 can be found here:
I have purchased my side molding, and I'm now waiting for warm weather to install them. I previously installed similar moldings on my Prius, and it was not difficult. Pre-measuring, with tape marking, and surface preparation, ensure the best outcome.