Booting into Recovery Environment. WTH?

We can call this:  Boot to CD, or Boot to USB.

In the "old days", this was simple:
You insert the CD and you press a key during boot, and voila!

Nowadays, it isn't simple:
Words like Legacy Boot and Secure Boot Mode come to mind.
In fact, it has become a pain.

I support many PCs and I need to boot the into RE.
Can you provide any general guidelines to make this once-simple process simple again?

Thanks

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