If you're still waiting....
TVHeadend can be on the same or different machines.
In Kodi
* System > Add-Ons > My add-ons > PVR Clients > TVHeadend HTSP Client
* Configure > Put your settings in (if it's on the same machine the defaults will likely work)
* Enable it
From the Kodi home screen again
* System > TV
* Change settings level to Expert
* Ensure "Use channel order from backend(s)" and "Use channel numbers from backend" are checked
* Go to Enabled and check it
On the Home screen there should now be a "TV" and "Radio" option from where you can open the guide