The Northwest Slopes route up Mount Neva follows snow and talus up the northwest face. Depending on conditions this route may be 100% snow covered, or involve sections of talus and third class scrambling. It should be easy to assess conditions on the approach. When conditions are good this is also an excellent descent route from the Neva summit.
From the Fourth of July trailhead, hike to Arapaho Pass and then hike around the southeast side of Lake Dorothy. The large north facing cirque of Mt. Neva that contains this route (as well as the Juliet couloir) will be obvious. This climb is the leftmost line, approximately 400ft east (climbers left) of Juliet.
If you desire to rope up bring pickets, long slings, and maybe a light rock rack, depending on conditions.