Upgrading to Droid X question

[MK17]

So my friends sister has an upgrade. She said that if possible she would upgrade to the droid x then trade him for his droid and $200. So she would have the Droid and he ends up with the Droid X. Is this as easy as it sounds or is there any tricks involved...

Edit: Forgot to mention that they are on different accounts

 

[jsquared]

its a matter of calling in to verizon and telling them the id number on the back of the phone, just use a third phone

 

[Backnblack]

It'll work.....