I JUST GOT A 78 CHEVY/GMC HALF TON WITH BAD REAR DRUM BRAKES. I AM IGNORANT ABOUT MECHANICS BUT I WANT TO LEARN EVERYTHING I CAN (ILL NEED TO WITH THIS BEAST I BOUGHT)

MY QUESTION, HOW DO I DETERMINE PRECISELY WHAT IS WRONG WITH THE BRAKES, THEN HOW DO I GO ABOUT FIXING IT? SHOULD I SET OUT TO DO IT ON MY OWN FINDING SOMEONE MORE KNOWLEDGEABLE TO HELP ME OR JUST TAKE IT IN AND GET IT FIXED?

THANK YOU