In reply to Siward: I'd say I'm about similar, done lots of scrambling and winter.
Of course anything can happen in March. But expect full on winter conditions and only hope for better. (I did the Fisherfields in shorts + t-shirt, no snow, last March
)
The hardest part is the ascent to Sgurr Dubh Mor, I felt the rest wasn't too bad. But if I were to try Sgurr Dubh Mor in March I would be going for a look without expectation. I found the ledges leading to the top not the worst bit. Getting across the saddle and routefinding past gullies was the hardest part for me.