Very easy but a little time consuming as, you will play 18 holes with four golfers.
From the play now mode, you will see tabs to add golfers in addition to the single default Rory McIlroy. Just add in three more golfers (I did all Rory's) and then start the game. Great way to also practice a specific course as, it is like playing it four times in comparison to a single golfer round.
Whilst playing, you also increase your chances of completing a round without going over par which will also unlock you the "Clean Sheet" trophy if you don't already have it.