A Temporary Restraining Order can be obtained from a court quickly (in a day or two) in situations where one cohabitant is abusing another. To get a Temporary Restraining Oder, very little evidence is needed, usually a signed declaration by the victim stating the abuse and / or threats will be sufficient. To make a Temporary Restraining Order permanent, there is a hearing where the victim must present additional evidence of abuse or a reasonable threat of abuse.
There are usually standard forms at the local courthouse or on their web site for an application for a Domestic Violence Restraining Order. In general, they come with instruction, and just need to be filled out and filed with the court to start the restraining order process.
If you are experiencing domestic violence, or feel a threat of it, you should immediately contact the police and leave if possible. When the police arrive, you can ask for their help in getting a restraining order. They are required to help you upon request.
No attorney is required to get a restraining order to prevent domestic violence, and you do not need any more.
An attorney that you hire, if possible, may make it easier for you, but it is not required.