Johnny, like Dragon I hear you on spending money unnecessarily. However, having done Albie's interview prep, for me a better analogy than your rifle one would be knowing you're playing in the superbowl sometime in the next year or so but not practicing yet because you don't have a specific date. Sure, you may still win, but why make it so hard on yourself?

The things taught aren't rocket surgery, but they do take time to think through and practice. I'm really glad that I now have time to think about how to give good solid interview answers at my own pace; I know that I'll be much more confident and perform exponentially better when I do get the call.

Additionally, and perhaps most importantly, once you pay for the workshop, you can go back and practice, brush up, ask questions, whatever, all you want. So there really is zero reason to wait, unless your budget really doesn't have a few hundred bucks worth of flex in it...while you wait for the interview that will basically define your life for the next few decades.

My $0.02: Do the prep sooner rather than later.