If a squirrel makes its way into your house, one of the first things that you should realize is that it will be more scared than you are. Another thing that you should realize is that there are ways to get the squirrel out of your home, in a humane way.
Start by allowing the squirrel to try and find its own way out. Be sure that you close off all access to other areas in your home, but open any doors or windows that lead to the outside. You should also leave the space, and allow the squirrel to make its way outside.
If this is not a possibility, then you should try a type of humane bait. This can be done with peanut butter, and then leave the room for a few hours. Chances are the squirrel will come around. You can also try the blanket method, which is when you hold a blanket in front of you and then drop it onto him to get him out of the house safely.
The fact is that squirrels have found themselves in a number of odd areas in homes. In many cases it will be much better for you if you simply call on a professional. There are a number of services that offer humane removal of animals from your home. There is no point in harming the squirrel, since they are likely just trying to find their way back outdoors.
Be sure if you do hire a professional that you make sure they are offering a humane method where they will catch and release the critter.