Pick a dry, settled day and start early, especially on a fine weekend when the small trailhead parking areas around Scales are popular. Mist, rain, and wind can remove the views and make the rock much harder to handle; snow and ice turn the ridges into a mountaineering undertaking.
Bring waterproof and warm layers, food, water, and navigation equipment. Treat the summit as a remote fell with no dependable services, toilets, or refreshments on the mountain. Early or late light is especially good for showing the folds of the ridges and the classic saddle profile.