Anything that helps you to drop expectations is best.
When you do dive in, do not hold back but let the experience engulf you. Curiosity and a mild smile are the best attire for the event.
They only "technique" that I would advise is simple breathing exercises. Nothing fancy or esoteric, just saturate your body with oxygen and blow out all of the waste gases in your system. Sit down comfortably and start by breathing out slowly, continuously and fully. While you breathe out, keep relaxing your body, never let the breathing out become a strain. When the breathing out has gently hit the bottom of your belly -- or even your toes, if you can -- you then let the breath flow rapidly back in to your whole body, quickly filling it back up. Immediately start breathing out again, slowly and gently, while relaxing any tensions that may appear. Rinse and repeat.
When you have done this a few cycles and you feel vibrant and relaxed, it is time to pick up your smoalking utensils that you had prepared before.
Remember a last time to put a smile on your face before you blast off. Breathe out fully one more time as before. When you reach the bottom, light up and breathe in slowly through your smoalking device, taking in the vapors while you breathe. When you have inhaled enough (you'll know) carefully put away the smoalking gear and finish inhaling with a deep toke of fresh atmospheric air, pulling the already inhaled vapors deeper into you lungs. Sit back and hold the vapors in for a minute if you can. Meanwhile, let the experience come over you.
The last part can be a bit confusing actually, putting back the gear, inhaling and settling down, all while the dmt is already hitting you hard. Don't worry though, you'll manage fine. If you want to, you could rehearse the mechanical motions without dmt in your pipe. It's probably not necessary and you couldn't rehearse the dmt hitting you anyway. Just have a clear idea of the steps of the procedure and it'll sort itself out.
Don't be too preoccupied with the preparations, Just enjoy the ride.