Thanks to earlier help, I am installing Accel SP wires... What I need to know is, do I strip just the outside wire (yellow/white) or do I strip the black conductor wire as well?

Unfortunately, I did the second and it has kept me up thinking all night.

If I did, will it still work or is this a $$$ lesson??
BTW, I really appreciate the all of the knowledge and experience on this page and for helping a newb like me.