I am a lawyer, so I'll give you my two cents worth. I have hired many people for my law practice that have had an ABA Paralegal certificate, as well as those who did not (ie, a Legal Assistant). As you probably know, there is no requirement in the legal profession to hire a person with a Paralegal Degree. It is, however, a good background for entering the profession at the entry level, as a person with out the certificate, or any formal legal training, will be relegated to administrative work. The Paralegal Certificate is a good icebreaker for getting into the legal field at the governmental level. Many agencies, like a D.A.'s Office, will hire paralegals right out of school.
My caution to you would be twofold though. First, the legal profession in general right now is a very difficult one to break into. I went to an Ivy League Law school, and you would be amazed how many people I know were either unemployed, or still looking for work in the field.
In Paralegal here in Colorado, the rate of employment for Paralegals 6 mo out of school is around 27%. For our area, that means nearly 75% of people achieving their certificate will have no job to show for it. Others on here have suggested working as a volunteer to get experience in the field, or simply to make contacts. I would really advocate that as well. Every Paralegal I have ever hired, has been a person I had knowledge of outside of the hiring process. PM me if you have any other questions about the field.