Probably, which is why I said you have to be careful about taking the advice to just "go work for a pro for a year". You have to make intelligent decisions about who or what you're learning from. Just because someone or an organization says they know what they're doing does not mean that they do. I think tree work takes quite a bit of good old natural horse sense. Thats something that you can't always learn from formal training. Besides all that, if no one ever did anything unless they were formally trained for it, not a lot would get done in our world. Nothing would be invented, places and things would not be discovered and our lives would be pretty boring. Not saying people should go hog wild and buy gear and start falling trees the next day, just that there is a place for learning by experience tempered by common sense.