In this recent video from The Slanted Lens, host and photographer Jay P. Morgan explains the benefits of having a mentor during the early stages of your photographic career. He then goes on to provide usable examples of how just about anyone can go about making a connection with professional who could fill that role.
Even if finding a mentor isn't something you're looking for at the moment, a lot of these benefits can be enjoyed by simply collaborating with other creatives who do what you do. Even with someone who might be less experienced than yourself, there is still a great opportunity to learn some things that you might not be proficient in. Cultivating good working and personal relationships with local photographers and filmmakers can be very helping to independents and small companies, and I've found that having a network of folks to call on when help is needed can be very useful in tackling larger projects.
A point that resonated with me in particular was when Jay said that one of the reasons to find a mentor was to "take away the mystique" that surrounds them. We build professionals up in our heads to be some sort of ultra-creative, business-saavy talent, yet in real life they're very much still just a hard working photographer. I'm guilty of this myself, and found that it builds confidence to work around your idols and see that their success is something that I could attain with continued dedication to my craft. In some cases, it can be quite eye-opening to see that their approach to certain facets of video/photo isn't all that different from yours. It makes me think of this popular article written by Lee Morris a while back, titled, "The Photographers You Idolize Are No Better Than You."