Youtube, instruction manual, or common sense?
After getting several quotes for undermount sink removal and replacement with a new one, I decided to try it myself.
It took about 4 trips to Home Depot and I nearly killed myself and almost destroyed the existing plumbing when the previous cast iron sink finally came loose from its support, but it all worked out in the end and the new sink looks great. No drips or leaks from the replaced plumbing so far. 🤞🏻