Simply click 'New Game' and choose a save slot, then the 'Jedi Temple' mission.
Play through the mission until you enter a cutscene where you are listening to your father and must complete the Jedi Trials.
The first trial is where we will unlock this trophy. You must move the ball along the line without letting it fall off and seeing red. This is easy along the straights, there is no time limit so do not rush, on the curves pay close attention to where the ball is compared to the line as you traverse through it, again remember... NO RUSH.
The one tricky bit is during the third and final set, there is a reappearing line that you must pass and cannot get caught on otherwise you will fail so for this instance you must pick up the pace and act fast (as you can see I only just make it). Upon completing this and finishing the rest of the trial you will be rewarded with your trophy.
I created this video to help:
Hope this helps.