Engine torque and normal wear and tear tend to twist a car's body over time. Even without a specialized lift, a few simple tools can help ensure that the body and frame are straight before removing any body panels. The first step is to support the car with jackstands at each corner near the pinch welds on the rocker panels. Next, hang plumb bobs from each corner of the car and measure to make sure the frame is straight. "Replace one panel at a time, because once you cut everything loose, it's really tough to line everything back up again," Austin advises. "Adjust doors to old quarters first, take note of the gaps, and use them as a reference point when attaching the new panel. Clamp everything down really well, and check door gaps and trunk gaps continually as you weld to make sure the panel isn't moving around on you. The last thing you want to do is have to cut a panel you just welded on back off for adjustment."