From Humbug Creek Approach, continue up the creek, staying in the belly of the drainage. After passing treeline, bank left while navigating some boulders and work your way into the left drainage that leads to a saddle to the southeast of half dome. Once you reach the saddle, continue up the ridge until you're at your line. The lines down half dome get less steep the further north you hike.
Beware of cornices! Due to its aspect, this ridge consistently holds large, dangerous cornices off the N-E side.