Not a horrendous video, it gives you the basics. Use pipe dope on clean threads. Kind of like toothpaste. It will do better than teflon tape in unexperienced hands. DO NOT reuse the rusty nipple like he did. Take the old one out, take it to the store so you can buy a new galvanized nipple of the correct length. Length needs to be correct for new tub spout. May not be the same length as the old one. A brass nipple of the correct length is even better, but not necessary. You can do it. Do not overthink it. The hardest part will be getting your old one off. The old tub spouts were cheaply cast metal that did not hold up well. Go gently but firmly to get the old one off. Check for leaks so you do not end up with a leak inside the wall where you can't see it. Good Luck! Bob