[null0pointer]

I would say it's critically important. You may be a good self learner, but even then you may not know _what_ to study. It's the whole unknown unknowns situation.

Another thing I would point out is that your peers offer more than just textbook-style knowledge. They can offer concise, intuitive explanations tailored for someone at your level. They can demonstrate the things they're teaching. They can provide immediate responses to any questions you may have.