Step 1: Srip One:
Step 2: Strip Two:
Then, strip a small section on insulation, but don't strip it all the way off!
You can measure the length against your breadboard, if you want to be really tense about it. Make sure you measure the insualtion that you will be cutting and adjusting, not including the exposed wire.
Step 3: Snip and you're done!
(There is likely going to be an automated version using a servo motor/ stepper motor instructable somewhere in my future!)