Sharp Edge is the most challengeing ridge in the Lake District. It's classed as a Summer grade 1 scramble but this doesn't fully acknowledge it's real nature. It's quite short in length and is easily accessible which is probably why so many people attempt it. Many under-estimate the challenge of Sharp Edge and find themselves in a dangerous situation. Blencathra is made up of Skiddaw slate which is extremely slippery when damp. Parts of the Edge are extremely 'polished' which makes the rock even more treacherous in damp conditions. On a wet or windy day it's best avoided altogether.
In Winter Sharp Edge is even more challengeing and should only be attempted by the properly equipped who have the appropriate skills and experience.
There are loads of walks for every ability in the Lake District. Have a look at bigwalks.com for some inspiration.