Spring? Old one? I don't think you're talking about a strut tower brace. You're talking about a sway bar aren't you? Is this a front or rear sway bar? If it's a front, just unbolt it from the lower control arms, then unbolt it from the car at the two other moutning points. Put the new one in (hopefully with new bushings) and viola. Shouldn't take too long.
sway bars aren't difficult either. just get a picture in your head of the stock set up, take if off, change the bar and voila, put it back the way you found it. go to the library (auto parts store) and borrow a chilton book if you need to troubleshoot.