How can I unscrew my outdoor hose that is fused to the spigot?
Connectors left in place for long periods can get fairly well glued together by corrosion or mineral deposits. A pipe wrench should do the job. FYI pipe wrenches have angled jaws, to loosen you want the jaw facing left when you use it, that way it wedges on rather than slipping off. If you want to avoid marring the fitting try a bit of rubber between the wrench and the fitting. Most folks have a rubber washing up glove that will work.