Definitely read The Paradox of Choice by Barry Schwartz, or watch him speak about the book (the book is better than the talks).

Basic concepts he shares:

-reduce the number of options (only seriously consider two options for your custom suit, not four)

-"satisfice" which means saying "I don't need the best, I need something that is good enough."

-limit the number of decisions where you can change your mind. "I only get one decision where I can reconsider today."

-make blanket rules that prevent you from having to make decisions "I can never cheat on my partner, so I don't even need to agonize over every opportunity to cheat that arises."