After seeing some videos of the trick, I feel like giving a quick basic tutorial for those who never played NES golf or other golf titles with similar mechanics before (like Mario Golf or Everybody's Golf).
The first arrow moving left after you press A sets the power, the more left on the bar it is when you press A the second time, the further the shot goes. After you set the power, a second arrow will show up from there moving quickly right, this second one sets the accuracy. Press A when the arrow is below the white part for a straight shot. Too early or too late means the shot will curve in mid air. Left/Right for direction. Up/Down to change clubs, this game doesn't auto select the best one so you'll to need to figure it out since there's no shot preview.
Link to the manual with club distances.
The game's still quite hard even knowing the controls so good luck! Maybe the motion controls are easier to use.