Ooh, I love it round Pendle Hill and the
Ribble Valley! We quite often do forum rides from Hebden Bridge out to the cafe at Waddington and sometimes go over the Nick o'Pendle - that's a 'proper' hill!
To get back on topic...
One of the 'hills' I hate most is the false flat coming back from Burnley towards Todmorden on the A646. It is only about 2% or so but I usually hit it when I'm feeling tired after a long ride and I just slow right down. It looks so easy that I feel that I should be doing 15-20 mph, but normally I'm only doing 8-10 mph.
Hills steeper than about 8% feel quite tough so there is no shame in finding them hard going.