Be sure to read Van's latest RV-12 Section 5 guidance (available on Van's web site under Revisions) for information in this regard and spend some time eyeballing the little buggers and practicing. Use a $30 (?) special Molex crimper tool. It's not hard, just finicky.
RS components or many other similar outlets should stock them. There is a production shop variety that is 5 times the price. This is the bare minimum standard tool.