Replacing brake pads (not shoes for drum brakes) is a fairly straight forward activity and possibly one of the best (besides perhaps changing engine oil) to perform yourself. Youtube is a great place to start. You can likely even find a full video of pad replacement for your exact model of car.
What is your current knowledge with using basic hand tools such as screwdrivers, hammers, and wrenches (for hex head fasteners)? Do you know how to replace a flat tire? There's lots of overlap with that procedure and changing brake pads.