Bring $30 and a sandwich early this Sunday to the Zephyrhills airport, there will be a bunch of cones set up that you can practice autocrossing. There will be a bunch of Porsche owners there as well as several other car owners. There will even be people that can give you pointers and help you out.

Seriously, the only way to learn is to do it. Everyone was a first timer once.
Look here and you will see there is a few other first timers wanting to give it a try.
https://www.tamparacing.com/forums/a...june-25th.html

Info here:
http://www.pca.org/sfl/autocross.htm

Don't be intimidated, any of the local autocross groups (NASA, BMWCCA, PCA) will welcome you. Just have fun.
Check the sticky at the top of this forum for schedules. There is at least 3 events a month within a hour drive of Tampa.