Alternating mouse use between hands:
Whilst people often default to using their dominant hand when operating a mouse,there is good reason to alternate between hands or always use the non-dominant hand.
This may provide a more efficient work set-up and reduce the risk of discomfort, pain and injury.
For mouse use with the non-dominant hand, the mouse should be repositioned to the opposite side of the keyboard. It may also be necessary to adjust the control settings of the mouse, which can often be achieved through software. These settings are often found in the ‘Control Panel’ under ‘Mouse’ control settings.

And remember- Don’t squeeze the mouse!

The position of the keyboard on the work surface is important as it influences the posture of the entire body.
The keyboard should be central and close enough to the user so they don’t have to reach forward to use it.

It is recommended that the alphabetic section of the keyboard be positioned directly in front of the user.
The G and H keys are usually considered the centre of the keyboard and these should be aligned with the midline of the body (in front of the nose).

Remember “H and G are the Central keys”