First, just let me say that I have almost no mechanical aptitude

Now, on to my questions. I have been spinning with SPD pedals all winter. Now I'm ready to put the clipless pedals on my road bike. Do I need a special tool to swap out the pedals? Is this an easy task?

Second question -- I just bought a different bike to take camping. I'd like to put an odometer on it. If I order an inexpensive one from Nashbar or somewhere, will I go nuts installing it and getting to work?

I appreciate any responses!

Thanks,
LTD