Most of the time, however, you get so focused on doing one project, you forget the damage consequences of the pieces and parts associated to the project you are trying to complete.
In the yard for example, more sprinklers are busted when people get overzealous with lawnmowers, edgers, and trimmers. If you have someone cut your grass and they do not understand your sprinkler system, they can destroy a lot of sprinkler heads.
Lawn edgers are notorious for busting plumbing and sprinkler lines as wells as chewing up cable lines. Plus, a landscaper with a heavy shovel can wreck drip lines, and inexperienced person with hedgers can cut hoses and bust hose bibbs.