I would start by studying the guide (linked below). Whether you use a lawyer or not is up to you, but if you are a fairly organized person, comfortable with getting the evidence needed for the forms, able to fill out the forms, and do not have a case involving any past legal issues, you probably do not need a lawyer, but that is completely up to you. The community at VJ will be happy to help you answer specific questions as you go through the process if you decide to do it yourself.
Good Luck!