Give your mouse a rest for a while and use the keyboard instead. This is better for your wrist and shoulder too.
Here a a few of my favourite Keboard Shortcuts for formatting text in Word.
To make text Bold select the text and then press the Control Key and the letter B
To make text Italic select the text and then press the Control Key and the letter I
To Underline text select the text and then press the Control Key and the letter U
To change the colour of text first select the text to change and then select the colour from the drop down list on the icon that is a letter A.
To Centre your text, press the Control key and the letter E.
To Right align your text, press the Control key and the letter R
To Left align your text, press the Control key and press the letter L
Enjoy!
Shelley
