It should not be complex job! You just need to stop the services, change the IP of the GigabitEthernet0 interface in the configuration and start the services back up. Use this guide to change IP address on PI :
http://www.cisco.com/en/US/docs/wireless/prime_infrastructure/2.0/command/reference/cli20_appendix_011.html#wp8796098100
-Thanks
Vinod
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-Thanks
Vinod
**Rating Encourages contributors, and its really free. **