I think it helped that I was a regular attendee at Mass before becoming a chorister so I had the advantage of years of singing in the congregation where you’re surrounded by people singing (or not) of various skill levels and it’s kind of expected that you sing around others. Most church choirs are pretty welcoming though and tend to be a bit desperate for male voices. Only the Cathedral choir had an audition process.¹ Beyond that, I think a big part of it is to just accept that you’ll be with other amateurs and you won’t be the only one who makes mistakes on occasion.

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1. The cathedral choir kind of spoiled me for choral singing though. In most church choirs, the accompanist will play choral parts one at a time for the singers to hear them. At Holy Name, they just played all four parts together and you had to hear your part in the chord.