The trailhead is on top of Grouse Mountain. You will either need to hike up (Grind, BCMC, Flint&Feathers) to the main chalet and then go to the trailhead. Remember you will need to pay 10$ to go down with the skyride from Grouse resort.
This is one of the first trails that I’ve done when I moved to BC. I love it because the views are great and the trail gets technical at the end. Would highly recommend it!