In all seriousness, double gloving is fine, but expensive. You lose tactile feel the thicker the glove you use (including mithril or adamantium). The best precautions are the ones that are up to you:
Don't allow your asisstant to decap/recap the needle while its in your hand.
Don't recap the needle with your opposite hand. Scoop it up instead.
Use your mirror, and not your finger for "distraction" injection technique.
Point the needle towards you, and not outwards when you're working your way to and away from the tray. A pt raising his hand to rub his nose or an assistant reaching across may inadvertently lead to a stick.
And if a stick happens, its not the end of the world. There is a very very small risk of infection.