Using the Klein 44223 pocket knife is a breeze. To open it, simply use the dual thumb studs according to your hand preference, and the spring - loaded mechanism will quickly deploy the blade. The liner lock will then keep the blade open for use. When you're done, disengage the liner lock and close the blade gently. Make sure to use the safety lock on the handle to keep the blade safely closed when storing it. To maintain this knife, clean the blade with a dry cloth after each use, especially if it gets wet or dirty. You can sharpen the blade when it gets dull, as it's sharpenable. Store it in a dry place to prevent rusting, and it'll serve you well for a long time.