Don't worry mate - circuits are probably the steepest learning curve you'll face during your training. The first few hours are fairly depressing, and if you're anything like me circuits will start to turn into cross countries as you try and get in trim, call downwind and do your pre-landing checks. As time goes by it will start to get easier and you've got the solo at the end of it to look forward to
As for the rest, Air Law's dull but you've got to do it - look on the bright side, you get the worst one out of the way first. The navigation book looks hard, but it's not too bad and you can ignore most of the book anyway. Play with the wind side of the whizz-wheel until you figure out what it is telling you (doing it with a pen and paper a few times helps), and then get your instructor to help you plan out a navex. Once you've done it a few times it becomes easy - after all, as an ex Vulcan pilot said to me, it can't be that hard or Navigators couldn't do it...
