I spent much of my breastfeeding time with my first child at church trying to anticipate others' reactions and accommodate them. I always went to the mothers lounge, no matter the hour in church, and even used a cover there because I saw a friend doing that. Eventually I got ok with no cover in the mothers lounge when I saw others not using one (again, just trying to follow others' cues about what was accepted).
With my second, I became more comfortable using a cover in sacrament meeting in class, realizing that if someone had a problem with that then it was their issue. But when baby started to get wiggly while eating, I banished myself back to the mothers lounge.
Then one miraculous day in RS, a friend just started nursing without cover or anything. And I knew she wasn't as progressive as me. So she really gave me the courage to start nursing in there without a cover. It changed my experience so much, not struggling to keep me and baby covered in vain, and still being able to be present and hear the lesson and participate.
I never got the courage to nurse without a cover anywhere other than RS. But it was still liberating and a positive experience.