How far must I reduce the risk?
To the lowest level ‘reasonably practicable’. That means reducing the risk until the cost of any further precautions - time, effort or money - would be far too great in proportion to the benefits.
Do I have to provide mechanical aids in every case?

You should definitely provide mechanical aids if it is reasonably practicable to do so and the risks identified in your risk assessment can be reduced or eliminated by this means. But you should consider mechanical aids in other situations as well - they can improve productivity as well as safety. Even something as simple as a sack truck can make a big improvement.
What about training?
Training is important but remember that, on its own, it can’t overcome:
Training should cover:
Here are some practical tips, suitable for use in training people in safe manual handling.
In the following section a basic lifting operation is taken as an example.
Think before lifting / handling. Keep the load close to the waist.
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"Getting to grips with Manual Handling: A short guide for employers" is an HSE publication, available for download from the HSE website.
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