Lovely little side track off the Harris saddle shelter, where you can drop off your packs to make it a little easier.
We went in October, there was still snow on the route up. Would recommend crampons if this is the case, as sections can be steep. Despite the snow it was fairly easy to follow the route marker poles to the peak.
The views were incredible down to the lake and around at the snow capped mountains. Then we popped back down for lunch and a hot drink at the shelter