Do it. You'll love it! Find a training group and practice. There is no substitute for getting your hands on the weights.

Last November we (The Tucson Celtic Festival) hosted the Lightweight World Championship, and let me be the first person to tell you that those "little" guys (under 200 lbs) can out throw many/most of the bigger guys!

Size and brute strength will get you so far, and can be an advantage, but learning the technique is the key!

Last thought...respect the caber. It can hurt you. Don't be scared of it, just respect it.