You can program it yourself but you'll have to invest some money into it.
You'll need:
1) Radio Service Software from Motorola (800) 422-4210.
2) A Radio Interface Box from Motorola or a 3rd party vendor.
3) A cable or adaptor to interface between the Radio Interface Box and the P1225.
I'm assuming you've already got a computer that's capable of running the software.
The radio shop would already have all of that and would probably charge you for the hourly rate for programming it.