[AndrewG]

I have 45 years of 'self-teaching' behind me and I'm still learning something new every day, be it about tone production, technique etc. One thing which always helped me was playing with more experienced and competent musicians whenever I could. Being stretched and challenged, rather than staying complacent and static and going over the same old stuff because it's easy, is always beneficial.
I'm still a hack and regret to this day not taking formal music lessons when I was young, learning standard notation and becoming a proper musician.