I don't know about self esteem building but just making myself feel better, nurturing myself, taking care of myself... Exercise, special soaps and lotions, taking my boys camping and doing other fun and educational things with them.
I took a community college piano class with one of my sons last semester. It was not good for my self confidence. I was a nervous wreck and a bad example to my son. He sauntered into every class with complete confidence despite my nervous incompetence.
I couldn't have been completely incompetent. It turns out we both for an A in the class. I guess that should boost my confidence some. I'm still deciding whether or not to take the next class with him. I'm also thinking about taking voice. I am terrified to sing alone in front of people but it's something I'd like to overcome. I did take a singing workshop with him earlier this year and I survived singing in public at the end of class then. Maybe I should keep working on it.
My son is a real musician, fiddle player, singer and professional story teller. So, we are always at music events and part of the music community. my mother could sing and play piano and guitar with confidence. Those were some of the great things about her. I wish I could be more like her in those ways. I see so much of her in my son. They would have adored each other.
The one thing I feel very confident about is my parenting. My boys and I are very close, even if I can't remember the words to the lullabyes my mother sang to me.