Drip rails

[Maxwell007]

Okay...I've looked at dozens of posts, many of them suggest shaving the rails. Others say to replace but I haven't been able to find one that shows me exactly how to replace the rail. I stopped by Brother's Trucks yesterday and looked at the new rail before I purchased it. I asked the guy how they were attached since I saw no holes for spot welding or screws. He had no idea how to install it. I then went home, looked at my truck and must admit that I have no idea how to remove the old one to even get started. I can see no welds, no screws, no nothing. What holds it on? Better yet...how do you get the old one off? It's embarrassing to have to ask this question as I'm reasonably mechanically inclined but for the life of me, I don't know where to begin. Any advice is appreciated. Thanks in advance for your help.