I just listened to this episode as well and I enjoyed the points brought up.
Something that I thought was extremely key (That you mentioned) was having a buddy/partner to shoot with. Not only does this create some accountability, but also someone to bounce ideas off, and do AARs with. The AAR portion I find extremely helpful. I'm extremely fortunate to get to shoot with my wife, so we talk about matches, practice, wind, etc. all the time. I've also been blessed in that I get to teach her, and this constantly makes me better as well.
I know Frank has brought it up before, and I'm glad it was brought up again, but the endurance aspect of this game to finish a match strong is extremely significant. At the beginning of every match, my wife is kicks my ass, and most everyone else's too... but as the day goes on, she starts to fade. It's tough to stay sharp and focused throughout an entire day; especially if the weather is less than ideal. With all the attention to detail required, you've gotta keep sharp, and treat every trigger pull like the first one of the day...
I used to shoot USPSA, and I picked up a book several years ago:
Practical Shooting: Beyond Fundamentals - By Brian Enos
This book can be applied to so much more than pistol shooting, and can even be applied to life in general, as it focuses so much on the mental aspects. Something that has helped me specifically from this book is being more tuned into awareness, and focusing completely on the present tense.
Here are a few quotes I'll leave you with from Brian's book:
"If I can function in the present tense and thereby allow focus and awareness to control my shooting, each performance will be consistent with my current skill level."
"As long as you shoot, your technique will change, but once you have developed the technical skills, the changes come from within -- not from more mechanical tricks. Accept that after the mechanics, there is shooting.:
"The truth beyond the technique. The application beyond the analysis. The means beyond the methods. Here's where we stop thinking & start shooting."
"Don't ever feel content with what you see. You could possibly see more. Learn to see things that you don't normally see."
"See what you need to see, no matter how long it takes. If you rush, and you miss, your vision is not with the gun."
"Relax AS YOU SHOOT; not just before you squeeze the trigger."