Only put in a wheelbarrow the amount of weight you can physically handle on an incline or when turning a corner and do not exceed the weight capacity provided for the specific wheelbarrow in use.
Make several trips for large loads. When you raise and lower the handles of a wheelbarrow, treat them like any other heavy load you lift. Keep your back straight and lift through your legs.
Balance your load over the wheel for good control, keep your speed under control and keep a tight grip on the handles
If you lose control of a wheelbarrow, let go of the handles and shout a warning to others. Avoid trying to move such things as planks with a wheelbarrow. Use a hand truck for long or awkward loads.