GUITAR, Vocal Coach
The disadvantage of total self-teaching is the lack of structured learning. It's very common for a musician who isolates themselves to start off strong, but then fizzle out when they get bored or stuck in their training. Without a clear path ahead of them or support to help them overcome hurdles, sadly their chances of success are minimal.
This is why even with plenty of determination it's important not to isolate yourself.
Instead, surround yourself with fellow musicians and experts who can help you on your journey.
All stages are welcome, from scratch to PRO