Really simple guide to access concentration for Buddhisty types:
1) drink some coffee
2) now don't do anything
That's it. That's the guide.
Conversation
All the bells and whistles around the practice tend to converge on just getting you to stop. fucking. doing. stuff.
Replying to
If you can act without explicitly doing, you are already on to something.
How? You're already doing it. You walk, breathe, talk and do a whole bunch of other things with only implicit control.
You just practice taking this faculty into areas you're trained to work explicitly.