It is easy actually. Just need to activate developers mode and use side quest. It also used to play standalone quest ports like Wolfenstein, Doom, Quake 2, Jedi Academy etc from Dr Beef.
I never had problems like yours - no headache, i can stand easily for multiple hours and don't get disoriented easily. If you having motion sickness there are comfort options in most if not all games, and you can always play in 30 min to 1 hour sessions before you get used to it. I also got few suggestions from youtube:
Strap your link cable like this if you are playing wired, then it's less of an annoyance and the port is harder to damage. I use Bobovr m2 strap myself, but it's universal.
Also put a small rug in the middle of the room to always know where you are while playing.
As for games, i liked TWD Sains and Sinners, Half Life 2 VR mod, Modded Skyrim VR is insane, Alyx was alright, Into The Radius, Paradox of Hope (got sabotaged by Metro publisher so dev rebranded it as ConVRgence with some changes) and some others. I have a thread in this subforum for vr action games.
And don't buy link cable that is too cheap, mine was eventually damaged and i had connection issues.
I have some other suggestions but i leave them for later. Gotta go.