Talk to someone near you with a big lens to explain.
- Use AI focus (continuous autofocus)
- Try and use centre point autofocus, keep the centre point in one place on the car ie wing mirror / front wheel / big decal etc
- Keep your panning action smooth ie keep panning as and after you took the shot (this will help reduce potential blur)
- use a fast shutter speed to start with and then reduce it depending on how you get on!
- Shoot in burst mode (take 4/5 shots and then have a quick review and keep the best couple!)
Happy shooting!