Here are my thoughts: I only play Merion for the Legend Ready Goes. It means you have to play it carefully, because there's not a "RESTART" option. Knowing that, in my opinion, you need a mental diagram about which hole you can go "for it" and the ones you have to play it safe.
In hole Nº5, you should play it +5 yards than usual, and always to the right. In case you want to go for the "safe play plan", leave it short (when pin is in front), and then you will have a 15/17 yard pitch that, with a decent ball, will lead you to an easy par putt. I know that holes 5 and 6 are hard to birdie. Calm down =)