Experts are experts first and competitors second. Experts share knowledge all the time if they are truly experts.
Take software engineers - they are paid or valued by the hour, exercise technical judgment on a daily basis, words are their tool, and they, and their clients and employers, are extreme competitors. Just like us. And yet they freely share tremendously valuable work in open source communities, and always with robust management encouragement.
Why? Because collaboration produces better code.
Be open and willing to put it out there and defend it, and then learn in the process. You'll be a better lawyer by defending your work. And then you'll be making better law.