It's easier than the fellsman, less ascent, a bit shorter, and the terrain is easier, more trail, footpath and road.
Navigation straight forward but as with a lot of these things 'knowing' the best lines, especially at night, is tricky.
regarding fitness it all depends on what you want to achieve -what sort of time would be looking at? what have you done on the fellsman? I could reccy some of the lines that are useful to know at night with you if you want