Your breath can be an amazing tool for calming the mind and relaxing the body. Try to slow everything down with some deep, long breathes; once you settle into your experience try less to manipulate the breath and more just observing it.
There is no “right” way to float. The most important thing is to get comfortable. The two main positions in the tank are with your arms at your side or with your arms over-head with your palms up. The arms up position is recommended to anyone who has neck or back concerns because it brings the spine further into alignment. Play around with the two to see which feels better for your body. When you are comfortable in your position, try to remain still and mindfully relax all of each body part from head to toe.
Let go of the thoughts that are stressing you, let go of the tension in your body, let go of everything and just be!
Avoid excessive movement in the tank; it will prevent full relaxation and therefore many benefits of floating. Also, the more you move, the more likely you are to get salt water in your eyes and/or mouth. The tank’s strong Epsom salt solution has an unpleasant taste and will sting the eyes. If this happens, slowly exit the tank and rinse your mouth and/or eyes in the shower.