Walk the course ...
Then walk the course ...
Then walk the course ...
Then walk the course some more .
DON'T leave the course mid-walk , no matter what .
I read in an Auto-X book once that in a SLALOM , you should concentrate on the SPACE between the cones and NOT the cones themselves . It sounds silly , but it seems to work for me

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Like others have said , SEAT TIME is the best way to get good at it .
Most important - HAVE FUN !!! THAT's what it's all about .