When using a post hole digger, there are a few rules that should be followed in order to keep the tool in working order, protect it from damage and make the task as easy for the user as possible.
When digging, avoid large rocks and roots in the soil so as not to damage the blades. If you see any rocks or roots then pick them out by hand.
If the soil proves too hard to dig, water it down to soften it up, and leave until it is moist before digging.
When thrusting the digger into the ground, let the handles go before the blades hit the earth in order to avoid the impact of shock from travelling up the arms and through the shoulders, as this can become strenuous.
Bend the knees, rather than the back, when lifting soil out from the hole to avoid straining the back muscles.
Wearing gloves can ease the task of hole digging as it gives the user better grip on the handles and helps to avoid painful blisters.
Once the hole is dug and the post is planted, rocks can work well as backfill at the bottom of the hole, as they help to stabilise the post. This also encourages water to drain away from the bottom of the post, which can prevent it from rotting.