My son had a 5 year old MacBook that had a broken trackpad. It is a great machine and has at least a few years left of service. Apple and an independent shop each wanted almost $350 to repair it.
The repair went great. The video was extremely helpful, and the directions that could be printed out step by step provided a great way to keep track of the screws and hardware that had to be dismantled and put back.
This type of repair is definitely something the average person can do. It is great to be able to independently repair something you rely on and not have to be reliant on others who will charge several times what the repair is worth.