Kathy, blazes seem to be close enough together that in "poor" visibility you can see from one to another. Above tree line you have the rock cairns.
Yes, the N Kearsarge trail goes from Hurricane Mt Road just north of N Conway to the summit of N Kearsarge where there is a firetower. While still in the trees there are open flat rock areas where the blazes are on the flat rocks. In the day time it is easy to follow. In all cases one should study the route before hand and know what to expect for any winter hiking. The fellow we talked to on the day this hiker died had not checked out several things on what he was getting into.