Basic field safety can be traced to two different things: preparation and attitude. Preparation starts before you even move the rig to the field. The big things are obvious and should be considered before you even bid the job. For example, ask, is the rig big enough to do the job? Too light of a rig is an accident looking for a place to happen - if you don't tear it up and hurt somebody, you're going to wear it out way ahead of its time.
Other preparation items on your basic safety checklist should include the following actions and probably a whole lot more. Ask yourself, are the drill lines in good shape, i.e. without snags, broken wires, birdcages, wickers, or other signs of either wear or neglect? Check the cable clamps at the anchor point, especially if your drill line is anchored to the crown. Are the clamps facing the right direction? Remember, the saddle of the clamp goes on the live side of the line, not the dead side. My daddy taught me to remember this with the saying, "Son, never saddle a dead horse."