Follow the regular trail from the Glacier Point road up to the base of the Dome (where the trail goes around on the right side)
Veer left at the base of the dome through bushes. You will get to a "ramp" leading right through boulders and bushes to a flater area with a big fallen dead tree. From there go more or less straight up a "crack" following the line of least resistance up to the top.
None required in summer.
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