My god, I know that hill from when I used to live in Blackpool and visit the Lakes regularly.
My advice is to walk up!!!
In all seriousness, there are sections of it which are very steep, but there is a lot which is not too bad. I would seriously consider adding another chainring to the front mech, and going with a triple.
For those kinds of climbs, pride goes out the window and it\'s whatever can get you up! Sometimes getting off is not a bad option , as you can often walk up a very steep incline quicker than you can ride up it.