I did this walk last week and it was excellent. I had the OS explorer map but relied mainly on the directions printed from this website and they were great - very clear and concise.
I did the walk with my wife, both in our 30s, not hugely experienced walkers but we had no trouble at all. We went a bit wrong trying to return via the northwest ridge and ended up coming down some steep scree slopes back into Fionn Choire, but otherwise all went like clockwork. The return trip from the campsite at Sligachan took about 7.5 hours, but I think our detour took about 30 minutes.
We were lucky with the weather, some patchy cloud on the ridge but otherwise sunny, and the views were simply spectacular. I'd never been to the Cuillins before and they really do live up to expectations.
Warning
Please note that hillwalking when there is snow lying requires an ice-axe, crampons and the knowledge, experience and skill to use them correctly. Summer routes may not be viable or appropriate in winter. See winter information on our skills and safety pages for more information.