I, too, have learned through consensus that 7-9 weeks makes for an ideal crop (i.e. shorter posting periods, increased probability of erect ears with correct posts.)
Also, a big thing about cropping, its not all about when they are done (some people have had them done at 14 weeks), but how well the ears are
posted.
Educate yourself
now on posting procedures, how to correct common problems, and purchase all of your posting supplies so you can practice, practice, practice! Good Luck!
