Is it just an old hack daily driver or your pride and joy? We got a mobile welder round our way that is stupid cheap and on an old banger we just let him loose as its not even worth getting your own welder out over his prices but if it's for a nice car we wouldn't let him near it we'd do it ourselves. For what an old fiesta si is worth and u say u have other problems probably not worth doing unless u can get a cheap mobile welder on the case