[header] How to get rid of a squirrel in your house [title] Stay calm. [step] A squirrel, much like most wild animals, is just as scared of you as you may be of it. As much as you want the squirrel out of your home, the squirrel's primary goal is also to get out of your house and back to a familiar environment. 
[substeps] Animals have a similar anxiety response to humans and respond aggressively to perceived threats to safety. By staying calm, you will prevent the trapped squirrel from having a severe aggressive response.