Hello all. I'm new to Team Camaro and have a question on instlling floor panels. I have a 69 convertable and purchased a left and right side fllor pans from the front to under the passenger seat. I don't have a frame brace and have to do the job with the car sitting on the four tires. If I do one side at a time do I still need to brace the car or can I leave it on the ground or jack up on four jack stands? Thanks.