Oh sure. All you need to do is access Apple's unlock database and submit the IMEI/MEID of the phone, making sure to avoid the lockout from the database that Sprint has by agreement with Apple. Easy.
If you don't have access to the databse, well
then the answer is the same.
International unlock only is available. I would assume you'd need to call Boost.
Domestic unlock - not possible.
I have no idea what you thought you'd be able to do to unlock the phone yourself. If it were that easy then the process would have been out there by now.