HR is more durable for sure. It's more wear resistant and a bit faster than regular 860. I'd go HR if possible, unless you want a different color.
If you do decide to go HR, make sure you or the installer understands that it's requires more "oomph" than regular 860. When you watch the video, it looks like RKC isn't pulling very hard. Realize he has some BRUTE strength from years of doing installs. He could probably crush a cue ball in his hands.
If you attempt to only match his hand and body movements, chances are you will be re-stretching in a few months because you didn't have the same "oomph" that he made look real easy. You have to get a feel for the weave of the cloth and when the video says full stretch, feel the full stretch in the cloth, not just how it looks on the video.
It's entirely DIY do-able but realize by the time you get done with the bed and rails (especially rails), you're going to have some friction burns on your thumbs or at least some sore skin unless you have some major calluses from similar work. I really enjoyed setting up my own table but it's not for everyone, just depends on what makes you tick.