How tight do you have your pedals? If you aren't yet confident with them, loosen them off some. Shimano seem to have their pedals quite tight out of the box, which isn't so helpful to beginners. It's not some macho contest to see whose pedal clicks the loudest... Although when I climb up a steep hill, I often pull quite hard on the upstroke if my cadence starts to fall, so if you do that, you'll want them nice and tight.