Very easy you don't need anything to get this done.

Hard to impossible to unfreeze with out the 10 digit PIN they mail you. Call 888-298-0045 to get a live voice - but they will not unfreeze it without the PIN!
 

Go ahead and get your mortgage account number and a couple of credit card numbers as verification.

To Unfreeze log in to https://annualcreditreport.transunion.com/fa/securityFreeze/landing you will need your PIN to unfreeze the credit.
 

Experian will ask you questions at the end to verify your entries like what county do you live in etc.

To permanently remove a security freeze, log on to www.experian.com/freeze or call 1 888 EXPERIAN (1 888 397 3742). You also may send the request to: Experian Security Freeze, P.O. Box 9554, Allen, TX 75013 and include all of the identification information listed above. You will need your PIN!