Learn how to be quick, thats running, writing all that shit.
Dont be all suspicious when theres alot of poeple around.
If your doing a peice where some gloves or some condoms on your fingers.
When your bombing always know where your at, you don't wanna get chased down by the cops and be running towards the station.
any other obvious stuff- oh yeah don't get drunk and try to go writing.
I dont know if it helps or not but when peicing I just use those white ones with the rubber things around them i dont know what there called, because I cant afford a real one. I havnt racked one yet either.