Bachmann 4-6-0 Big hauler - DCC conversion?

[MountainGuyz]

I'm new to the DCC process, so thanks for bearing with me.. I have a Bachmann Big hauler 90088 King Coal Stream Passenger Train.   How difficult is it to install DCC in the 90088 big hauler king coal passenger train?  Should be installed in the loco or tender?  Does anyone have a "lessons learned" experience from a past install of the "big hauler" series?

Thank you in advance.  
-Bill