"Actually I've never had formal training, I was lucky enough to continue working most of my career and aside from sitting in on a couple of classes, here and there, I basically just use my own instincts"

Nancy McKeon is suggesting that she has not had any formal training in her profession, but has actually instead depended on her own instincts. She acknowledges that she has had the chance to sit in on a few classes, however that she has mainly relied on her own instinct and experience. This suggests that she is a self-taught individual who has actually had the ability to develop her skills and knowledge through her own hard work and dedication. It also suggests that she is positive in her own capabilities and trusts her own judgement. This quote is a testimony to the power of self-learning and the significance of trusting one's own instincts. It is a suggestion that with effort and commitment, anyone can achieve success without the need for official training.