If you are
male, make sure the seat is up, unless you are at a
urinal. Be sure both both feet are firmly planted on the ground, and maintain proper
balance. Check if the
organ in question is outside of your
pants - this is crucial! Use both hands to
aim. Do not
laugh. Avoid
distraction and maintain
concentration on the task at hand. And
never, never bounce a tennis ball during urination! See also
How to Use a Urinal.
If you are
female, I can offer no advice