Sorry for the noob questions. I've never worked with these before.
needle nose maybe. then clip with a small set of wire cutters or capable scissors i suppose... [edit] maybe pair of needle nose [/edit]
Could also just put them in there and when all the wires are in the correct spots, clamp it down with the keystone jack cover. I have really small fingers and endless patience for that sort of thing tho.
Butter knife