That is good advice. I want to be able to recognize the notes in the progression before even playing a note, like during the intro of an unfamiliar song were the bass hasn't come in yet
There was a time when there were three key players in the house, with the better of the three sitting on the front pew listening to the other two. I had NO idea what they were doing or where they were going. In the midst of my struggle, I happens to glance in his direction.
Noticing that I was waaay, waaay, waaay off he threw a ‘wait’ finger up at me while he listened. He never heard the song either but he was able to follow the progression moves.
And he walked me thru that whole song with the number system, from about 25 feet away from me. So, while everybody was watching the choir director, I had my head cranked the complete opposite direction, looking into the congregation and killing that song. They thought I knew the song.
So, yea. “Save your life!!” He saved my life that day. I wasn’t joking when I said ‘say it again!’