To help you to focus, imagine you have on your head a soundproof helmet, with just a small slit for the eyes. The only thing you can see is the table.
On view are only the bidding boxes, and after the auction is finished, just the cards.
This is a magic helmet, which banishes all emotional thoughts from your head. You cannot remember how well or badly that you played the previous board.
You cannot remember if your partner played well or badly the previous board.
You do not feel superior or inferior to the opponents at the table.
You cannot remember previous results against these opponents (good or bad).
These opponents have no personality (positive or negative).
You feel neither hot nor cold, well nor unwell.
You have not been lucky or unlucky so far today, yesterday, this week, this month.
All you are able to do is to fully concentrate on this hand. On this hand ONLY and nothing more!