In reply to NigelHurst:
I've done it the wrong way loads of times. Up and down Snowdon via Crib Goch makes a good day with lots of scrambling.
It's good experience to practise scrambling down. Especially if you ever go to the Alps, where downclimbing is often unavoidable.
Finding a way down through the steep rock band is the crux of the descent. Again, that's a useful skill to learn.
There are no particular problems passing those coming up. The are plenty of passing places on the ridge.
Descending Bristly Ridge and Tryfan North ridge is the next step up. The latter can be quite taxing actually.