I hear ya loud and clear. I once "laid up" a 7 iron 200 yards!
A couple solutions for ya:
1. Pretend that you're really going for the green, but just take a couple clubs less.
2. Pretend that there's a pin right where you're trying to lay up to.
If you can trick your brain for the 2 seconds it takes to swing a club, both of these should give your swing the normal levels of tension and doubt. This should get you out of this relaxed, composed state of mind that you would've had to deal with.
