Each individual must judge for herself as to the best way of reaching the quiet.

I will give several recipes and you can take your choice.
First, to quiet the body:-- 1.

Lie still and see how quietly you can breathe.
2.

Sit still and let your head droop very slowly forward until finally it hangs down with its whole weight.

Then lift it up very, very slowly and feel as if you pushed it all the way up from the lower part of your spine, or, better still, as if it grew up, so that you feel the slow, creeping, soothing motion all the way up your spine while your head is coming up, and do not let your head come to an entirely erect position until your chest is as high as you can hold it comfortably.