Like BB said: No excuses.

Do some homework (go to the SSA or any big club website and there will
usually be links to find info about racing rules, procedures, etc.).
SRA is another excellent source.

Read Moffatt. At least twice.

Then show up and give it a try.

Don't obsess about the "racing" aspect - you will find many pilots who
"race in order to fly", instead of "flying in order to race". (That
approach tends to change as you start doing better, by the way!)

Warning - it is addictive!

Kirk
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