That's a good enough starting point for anyone.
I once read an article on scopes that stressed the importance of re-centering a scope every time you remove it, or anytime you get a new scope. The reason being that all those adjustments made in the past are compounding, and you just lose track of where your adjustments are, or some such nonsense.
Unless you have a mount that's adjustable for W&E however, it makes no sense at all. No matter where the adjustments start, they're going to end up in exactly the place required for a zero on the next installation. No matter what.
That being said, if for some reason you really do need to optically center your reticle with the tube, remove it from the rings. Cut a stout cardboard box, or wooden box, with two "V" cuts-- one for each end of the scope tube (one forward of the turret and one behind the turret). You can line the "V" cuts with felt for easy rotation of the scope and to protect its finish. Rest the scope in your "V" notch stand and look through it while you rotate the scope with one hand. If the reticle's aiming point orbits around the optical center, it's not centered. If it stays put and doesn't wobble, it's optically centered. I don't know what that does for you, but it's centered. Once you mount the scope, you're going to move the reticle to zero the rifle, so what have you accomplished?
I might one day be convinced that there is a reason for doing this, but right now I can't think of one unless you have an adjustable mount.