Trust me! I did a ton of fiddling, and no matter what, I could never get every label printed in the center. On each page, some on one part of the page would be centered, and others would not. Or I'd get it where I was pretty happy with most of the centering on one page, then the very next page with the same settings would be a little off. It was a laborious process and I would not do it again to save a few pennies per label. I'll leave printing labels to the professionals.
On the other hand, sticking finished labels on chips is a breeze, and actually pretty fun. I did about 600 with this set, and have considered several other relabel projects. Would not hesitate at all to take one on, even for many more than 500 chips. Dozens (hundreds?) of PCFers have done it.