Confidence. Cocksureness. I prefer the second term, bitches, but they're similar in meaning. Know yourself and how badass you and your ideas are when going into a co-writing session. This way, you'll always know that your vision and yours alone will be preserved in the final product. Cooperation is for hippies whining about the free-market and holding Bernie Sanders signs. Be the gall-dang paterfamilias in any situation in which your name will be attached to something that will bring in dat cheddar.
Say you've got a meeting set up with Joe Songwriter and Jane Sweetpants. Go into that sumbitch with a title, theme, chorus, and tempo. Tell Joe and Jane to fill in the verses because you're too money to trifle with that bullshit. Be the race car driver. They're the crew. This is what makes a good working relationship: boss and underlings.
You don't go into your everyday job and tell your boss "I think we should flip the burgers every 30 seconds, not every minute" or "What if we picked up the garbage on one side of the street first and the other on the way back?" Hell no, it doesn't work like that. Somebody has to be in charge. Be the HMFIC of your songwriting group.
Creativity can only flourish when controlled and guided by the humble genius of a certified songwriting G. Be the G. Gold-plate that iPad. Add that grotto to your swimming pool. Well, not you… me… but you know what I'm saying.
Get out there and create, monkeys!
*not actually written by John Rich