|The very first thing to do is asses the condition of your paint. This will determine the path to follow in order to correct the paint.
Also another important thing is prep. Prep is key to achieve the best result possible.
Here are some steps to consider when correcting paint.
Rinse (pressure washer recommended)
Spray foam with foam gun (if available)
Clay (I normally use the same water/soap mixture used for the wash as lubricant)
Wash again (not necessary but like I said above, prep is important)
Dry (leaf blower is recommended, but if not available a MF waffle towel will work)
After the wash and clay are done you will then inspect the paint to determine the best path to achieve the highest percentage of correction without removing too much clear (we are talking microns, but still the least material removed the better)
Unless have deep scratches or very oxidized paint, then a wool pad and compound will provide too much cut. You need to find the happy medium between the least aggressive abrasive and the best correction possible.
It's never "DONE", just finished enough to drive :-) - BigTDogg