I have considered not accepting every job I've had since graduating college 10 years ago for this exact reason, and I have ended up being one of the top perform

I have considered not accepting every job I've had since graduating college 10 years ago for this exact reason, and I have ended up being one of the top performers at each of those jobs, which has led to better job opportunities, each of which I don't believe I'm qualified for. One thing you have to accept is that you will never know everything, and that's okay. One of the most important skills you can have is the ability to communicate effectively. Customers and coworkers don't expect you to know everything, and when you tell them that you are weak in some area and want to have your expert friend/coworker assist because you want to make sure you get this completed correctly for them, they see you not as an expert on all things, but instead they see you as something much more valuable: someone who they can trust to get the job done correctly. There is value in knowing your limitations. If you know you can't complete a job on your own, and you can't line up the right people to assist you, then it's a wise move to pass. Like the important/unimportant-urgent/nonurgent quadrants (from the 7 Habits book), there are the competent/incompetent-secure/insecure quadrants which let me say that I am completely incompetent when it comes to brain surgery, and I am not the least bit insecure about it. I am also very competent at my job, but ironically I am somewhat insecure about my ability to do that job. I am a generalist in my field, and I think part of the tradeoff is, there are always people around me who know more than me in some areas, but in return, I always know I can get a new job in about a day. If you take the generalist path, it's important not to get into adversarial pissing matches with the specialists. Win them over as friends and it's of mutual benefit. As a generalist you have exposure to more opportunities, which you can throw their way, and they will be glad to help you when needed. And by "help you", I mean paying them to help you (usually).