You don't need to be professionally trained and you don't need to go to classes before hand, you just need to come along and be willing to have a go.

Deuteronomy 16:1-22

Reference:  v.11  And rejoice before the Lord your God at the place he will choose as a dwelling for his Name - you, your sons and daughters, your menservants and maidservants, the Levites in your towns, and the aliens, the fatherless and the widows living among you. (NIV Bible)

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