This is so much easier than it seems. You're literally just going to unscrew the aerator screen where the water comes out of your faucet and attach a nozzle or you're going to unscrew the water line under the sink with a wrench and attach an adaptor for the RO/DI, all done with just a wrench. YouTube is great for a visual how-to so you can see what to do step by step much clearer than what words can explain.
Yeah I was hoping I could just screw into the faucet but my wife purchased all these fancy display type faucets in our house so I don't see any screw threads. some simple under the sink work seems feasible I suppose. pulling the trigger soon. :-)
