Correct this English, practical on sharpening of pencils

Here is a corrected version:

"Sharpening pencils can be a useful skill to have. Firstly, make sure your pencil sharpener is clean and in good working condition. Insert the blunt pencil into the sharpener and twist it until the desired sharpness is achieved. If the lead breaks, it may be too sharp or the pencil may be inserted incorrectly. Adjust and try again. Lastly, clean out any shavings and store your newly sharpened pencils in a safe place."