Re: Getting Your Mind Ready. Fast.
I think the common way Aikido class is started is the best way.
When you walk into the dojo and bow at the door, your process starts there, then focus on getting ready for class. Let everything else wash away, and only work on what is at hand; getting ready for class.
It's funny that you say something that takes 5-10 minutes, because as time goes on, it will start to happen almost instantly. You'll get there, just stay focused.