[mythtv-users] tv_grab_au_req changing from tv_grab_au help required

[Babstar]

Hi,
    Currently I use tv_grab_au (datasource d1.com.au) but I am wanting
to switch to tv_grab_au_req.  In addition I am moving from Melbourne to
regional NSW.
 I have googled but am having a hard time getting coherent  information
about exactly how to achieve:
1) The switch to tv_grab_au_req without  breaking my existing database.
2) Moving locations to a new set of DVB channels and again avoid
breaking the system.

If possible can I set up the switch to tv_grab_au_req to help with
moving problem?

Any clues would be helpful

Ben