Not sure as I did the approach from Flat Rock years ago with climbing some routes along the way.
In Kevin's 'Sublime Climbs' Guide he suggests going up the Flat Rock track for about 200m, and then veering off up left to the cliff for access to Clicke Wall.
When near the cliff just walk left towards Guernica Block. The climbers/boulderers foot pads from there on are easy to follow..... just along the base of the cliffline.
His time suggestion for the Kindergarten is 20 mins, so add on some more!