In reply to Oujmik:
A classic Cuillin question that is impossible to answer because "how hard" is in the eye of the beholder. Key factors that will affect the answer will be-
1 Visibility- key to getting to the right place & finding the easiest line
2 Being on the right line- learn to recognise where others have been and when you're off route with no signs of wear or crampon marks. Cuillin routes are graded for the easiest line & off track will be harder
3 Wet- slippy rock feels a lot harder than dry; use An Stac bypass if wet.
4 Your confidence
5 Your partners confidence
You're barking up the right tree with pitching taking too long. On An Stac & along the whole Ridge there's rarely a section more than 10m long without a good natural ledge or block break. Mostly it's easy scrambling. The key technique you'll need is some short-rope cleverness. Keep most of the rope in your sack, keeping out 20m which is tied in by a fig 8 on bight to your harness. Coil 10m around you with a hard lock (this is in case you disagree with my 10m rule & want to run it further
& rest around you with soft lock. Any worrying steps uncoil this, clip your partner on with fig 8 on bight straight into belay loop. Scramble the exposed move & bring them up on a very tight rope by hand or shoulder belay. Repeat until section is passed.
In doing this I encourage a Victorian mentality- they had no gear but used natural features & their rope cleverly. Most importantly they followed the rules of "leader mustn't fall" and "don't climb up something you can't climb down". If it becomes hard enough to warrant placing runners you're probably in the wrong place. In these cases either go back & find the right way or turn your situation into more of a conventional pitch.
Practise your coils, holding each other on shoulder belays etc before you arrive.