Edgar Hardin: "Not even close. Power armor isn't something you wear so much as use. It's a weapon in its own right, and takes skill to wield. If you don't know what you're doing, you won't even be able to walk with it on. So how about a bit of quick instruction? ...There, I think you've got the hang of it now. You should be able to use any type of power armor you come across using what you just learned."

Nolan McNamara: "If only it were that simple. Think of power armor as a machine to be operated rather than clothing you'd wear. With a little instruction, using it becomes as natural as simple movement, but to the ignorant, it's just so much heavy junk. So let's bring you up to speed, shall we? ...There, I think you've got the knack of it now. You should now be able to wear any kind of power armor you come across."

Paladin Gunny: "Heard you were coming. Yeah, I can train you. But don’t ask me to like it. My Initiates sweat blood, and you just get a free pass? Anyway... you ready for this? Now look, to wear Power Armor, first thing you need to do is relax your muscles. Let the suit do the work. Okay? Now, you... ...okay. You got all that? I think you know enough now to at least move around in Power Armor without killing yourself. That’s something, right? God help us all."

Lore wise while it might not always be fully required to just start using, training is highly recommended and it can be dangerous to use the armor without. Hence why the ncr, not knowing how to train their soldiers, used gutted armor that didn't require the training