From most of the research I did including from the archives in this site I found that it was not a good thing to use a skimmer during cycling since it pulls about everything out of the water and also not to use one for about a month or 2 after the cycle. Also not to use charcoal until after the cycle.
I didn't start using mine for about a month and a half and started working right away. I still don't wuite get the break in thing since most skimmers I have seen don't have any moving parts to "break in" . So why would you need to break in something with no friction generating moving parts? There's mostly just tubes with a pump blowing water and air creating bubbles that carry gunk to the cup.