To those who are sleeving there PSU and accidentally mix the color, here is the remedy;
All about the various PC power supply cables and connectors
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As you can see on the link above, it shows every location of the wire and its color coding.
You just need to know the number of that wire base on its color. No problem if same color are mixed since they do have common voltage. Just take a look at the diagram and you will understand better since it was properly demonstrated.
Sleeving a fan sample link:
How to sleeve a fan (or anything else, really) - The Tech Repository Forums
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As you can see on the link, he removed the header clips which is not necessary since you can slide the sleeve already, maybe he did it for his convenience.
Removing a sata power molex from its connector link:
3
Happy sleeving.