Tvheadend

Greetings.
I seek to set up a PVR on Kubuntu (or other Linux distro) to replace my Windoze BeyondTV PVR.
Tuner hardware : (2) Hauppauge HDTV tuners, (1) HDHomerun
As I have become that proverbial old dog you cannot teach new tricks to (brain, brain, what is brain?), I need step by step guidelines. The major obstacle that prevented me from migrating earlier was the lack of a free EPG for North America / USA.
- - - (Or is there one now ? TitanTV claims to act as a front end for "some" software, but when I contacted them directly, they couldn't say which packages scraped their site or utilized their services. https://titantv.com/profile/pvr.aspx)

BeyondTV is an orphan program, and no longer supported nor compatible with Windoze X & XI. It struggles with Win7. But its EPG still is maintained and usable.
Which leads me to the question : IS there a way to access the EPG file and use it in TVheadend ? How would I recognize an EPG data file?

Without a free EPG, migrating to Linux is not an option.
Alternately, do other applications (Kodi, Plex, etc) have access to EPGs that can facilitate scheduling recordings?
[>+<]
Recap : Need step by step instructions for installation / migration, and an EPG for N.America.

Thank you,
JG