Think before you start work- Know the risks!
Understanding what can harm you is half the battle. Your manager is required to undertake a risk assessment of your workplace to determine this and should be briefing you on the steps you should take to be safe. Circumstances can change so always think about potential risks before you start work. Its important to remember that health and safety is about risk management not risk aversion; its about taking sensible precautions not bureaucratic back covering; and fundamentally its about saving lives not stopping people living.