I did it in 2008, its a great ride. Its not that hard, the Bealach na Bà (note spelling 🙂 ) itself is fine really, the worst bit is the circa 2 mile straight section, but before and after that it’s okay. Go easy on the decent though, I saw a few people shoot across tight bends and into ditches.
The rolling roads after the Bealach are hard going but its nothing to fear.
If you get to the pass before the road is closed then I would just crack on with it. I got there about 20 minutes before the road was closed and hung about till it was closed, as many others were doing, on reflection I should just have carried on.
edit: yeh miles in your legs will definitely be of help!