hi bairn, my mate and i walked to the top many years ago,we stoped every now and then for a rest but overall its a pretty kind walk,like robbo said we did the same,it was in the summer and it was quite warm at the start,we were in jeans and t shirts, by time we got to the top we were freezing,it was freezing fog and snow balls the size of cars, so take the right clothing with you!!!
but it was well worth it, the views are breath taking,and the experience.
have fun and enjoy.
tillylamp