"Key thing is to get located centrally"?
What's meant by this is when placing the printed paper label on the CD ensure that it fits on properly, does not overhang etc. If you don't locate it properly then out of balance could occur I guess.
Regarding printers, to use these you have plain printable CD/DVD media. There has been speculation on this forum that these are not a good idea. Personally my experience would tend to lead me to avoid using these. Others may have more positive experiences.