This how you have to play to get into single digits, based on my experience having been there.
1. Get the ball on the green or green-high in 38 strokes or less.
2. Get your first short game shot* on the green. Two short shots in a row is a big no-no.
3. Hit greenside chips to one-putt distance.
4. Hit approach putts over 20 feet to one-putt distance.
5. Be very good putting from four feet and in. I mean VERY good.
* Pitches, chips, sand.