This lets you use it even at level 1 and keeps your killstreaks, weapon and perks but doesnt make them pro

What you need:
* Account to prestige
* A friend

How to:
* Go to custom class you want to keep
* Go to copy and hover over the slot to copy it to
* Get your friend to search for a game and back out
* The copy class pop-up should still be up and you can still click things behind it
* Go and prestige
* Now click A on the copy custom class slot