Even Al Unser has said regarding autocross... "this is a lot harder than it looks".
I've done an SCCA Starting Line School which mimics a lot of what is taught at the Evo Schools I've been told. I learned a ton that day. If you are going ot race your car, I think it's best to have a qualified instructor get in your car and show you how to make it fast. Then switch back and forth between the left and right seat during the day.
Most of the instruction I've received during track days has mainly just involved that particular track...line choice, braking points, etc. It is invaluable as well but more track related than just plain driver coaching.
A bucket list item for me is a full blown weekend at Barber, Bondurant or whatever where we get to flog their cars all weekend while working just on the driver.