Measure ride height from the center caps of your wheels to the top of the wheel arch. Make sure the car is on a very level surface, for accuracy. Each time you lift the car up to adjust the height, roll it backwards and forwards 5 feet or so, to settle any extra load on the suspension parts. Good starting points for ride height are 12.25-12.5 inches from the center of the wheel to the top of the arch. There can be differences from front to rear, but try to make it all level from side to side. If you have friends to help, put somebody your size in the driver's seat when measuring ride height (or better yet you sit while they work). After setting ride height, you can corner weight (if you have scales) by making finite adjustments in ride height and preload. I don't know many guys who go through the trouble, though. If you want to be that picky, you have to be willing to relocate parts in your car to evenly distribute weight.