Using the Klein 44037 Sportsman Knife is a breeze. To open the blade, simply hold the handle firmly and use your thumb to unlock and flip the blade open. Once open, the lockback mechanism will keep the blade securely in place. You can use it for a variety of tasks like cutting fishing lines, opening packages, or working on small DIY projects. When you're done, make sure to close the blade carefully. Just press the lock and gently push the blade back into the handle. For maintenance, after each use, wipe the blade clean with a dry cloth. If it gets wet, dry it thoroughly to prevent rust. You can also apply a small amount of oil to the blade and moving parts to keep them in good condition. Keep the knife out of reach of children and store it in the provided leather snap case when not in use.