Initially, I could not co-ordinate the instructions; hold can with rim resting under metal pin, press lever (making sure blade is in correct place) to start motor. The motor started, but the can did not stay in place, and the blade did not pierce the can quite a few times. Also if magnet is not put in correct place the lid drops into the can. Eventually after much concentration I got it to work perfectly. You can even leave it and get on with other chores.