With YouTube and everything out there, it's not impossible to be self-taught but you'll make the biggest gains under the wing of a good teacher.
If you get lessons from a good teacher you run the risk of knowing what you are doing. Avoid that.
A good teacher can explain a concept in several different ways, and a book doesn't do that.
And if you decide to go this route, therein lies the toughest part
finding a good teacher. After a year of noodling around, watching some instructional vids (DVD's and YouTube) I finally dropped a chunk o' change on a small, but conveniently located, music store's lessons. They assured me he was "our go-to guy" for beginners bass lessons.
I won't say "I want my money back!", but getting half back would certainly be appropriate. His teaching method was all over the radar. He was rather manic and hard to follow. I could barely retain half of what he was trying to teach me, despite (or maybe because of) the hastily scribbled notes in my notation book. I even told him on our second or third lesson,
"Dude
slow down. I can't keep all this in my head with this breakneck speed. I'd rather retain a small amount of information each lesson rather than trying to cram in a ton of stuff and barely remember half of it." And for the rest of that half-hour lesson, it worked
until the next lesson, and it was back to mad scramble of herky-jerky-style tuition. So I went to the rest of my lessons and didn't sign up for them again.
Lessons aren't necessary to be a successful player but they never hurt.
Unless they cost you a fair amount of money for little return, that is. My wallet may not have been crippled, but lessons aren't cheap, especially with stores adding on a one-time "Registration Fee".
But ultimately, that's the trick
finding a good teacher. There's no guarantee that the first will be "the one" or "the best ever". Now, I absolutely will not pooh-pooh taking lessons. I've been considering taking more later this year, only at a different place. I know I may be setting myself up for another waste of time, effort and money, but if I don't try, I could be missing out on a great opportunity to advance beyond and polish what I've already learned "by ear".
Another bit o' perspective; learning "by ear" may have served me well enough when I was learning to play drums, but I know there are big gaps in my knowledge. Also, I probably would've learned all I know much faster with proper tuition. So that's why I took, and eventually will continue to take lessons.
So, if you do decide to take lessons, I hope you find a teacher you really click with. If not on your first try, don't be discouraged. Just try to figure out what didn't click with them and bring that knowledge, along with whatever you managed to learn from them, to another instructor.
Good luck with the path you choose!
