It takes steel to sharpen steel.

Practice in your home not public.
Song circles by nature are an open clique.
An "open mike night" in the local pub is open.

It has been my honor, through the years, to sit in a private audience of 30 in a private home where musicians perform their recitals the week before they are on stage.

Some have been solists before international tour.
Stangest was a tuba-piano combo, before the master's recital

Worst was a community choral group whose solists could have cracked the tile in a shower-room. Unfortunately, the entire group had grandoeous opinions of their material and talents. THEY were AWFUL and didn't have a clue.