Rabbi Nachman of Breslov describes the mitzvah process like this...
When someone feels the desire to do a mitzvah, they get joy in their hearts. This joy rumbling inside them is the equivalent of Malchut going up to the Legs (Netzach, Hod, and Yesod). When it reaches there, then the person is going. Moving. Marching towards the mitzvah. Either he's going to the store and buying materials for it, or preparing somehow. But he's moving. The Legs bring about an arousal from around.
Now everyone is looking at his quick actions, his purposeful movements. They want to also do this mitzvah. They too become agitate and aroused. Now everyone is moving.
Now comes the mitzvah. Usually before a mitzvah, there is a blessing to be said. Saying this blessing is equivalent to bringing the Legs up to the Arms (Chessed, Gevurah, and Tiferet). Now blessings are flying around. We are sending blessings out, blessings are coming our way. Its great to do mitzvot.
One blessing that usually comes from this is intellect (Chochmah, Bina, and Daat). This brings us wisdom, understanding and knowledge. If we are smart (lol) then we will pray for faith/Keter. This would be the crown to seal it all.
Keter is like a helmut. On the one side, we have emunah/faith. This faith seals in our knowledge and keeps us secure in what we know. If we dare to venture too far -with unanswerable questions- we are brought back to base with faith.
But the other side of Keter is the outside part of that crown. That is called Malchut. Yes, its Malchut of the next bunch of sephirot. And the beat goes on.