How to decide and enjoy it!
Interesting study on satisfaction that seems relevant:
"the best way to feel better about the one choice we do make may be to put up a literal barrier to any of the other choices." In the study, they put a lid on the box of chocolates.
In interior design ... STOP LOOKING. Stay out of the tile stores, stop looking at HOUZZ and get all but the chosen sample out of your sight.
Kick back and enjoy the way the light bounces off your travertine backsplash and stop tormenting yourself wondering what it would be like if you had splurged on the laser-cut marble paisley.