As sure as one can be, of a thousand year practice.

[ Look, if he can move his shitty robo-limbs into this position and stay like this, you can too Keith. ]

Now, if you are comfortable enough, close your eyes.

For humans, the next step would be to consider your breathing. Allow yourself to focus only on your inhale, and exhale. Your goal is to only allow your mind to focus on this task.