It might be the least casual racing game you can buy on consoles right now.
You know me for not being a big fan of pCARS' tyre "feel", but even looking at people who are good at racing games and like pCARS (Alan from VVV and some replays from the OT time attack leaderboards), I'd say that's still the least casual... and there are the out-of-the-box controller configurations that absolutely nobody seems to like.
Also for everyone who thinks, this game is SUPER SIM(!!), look at some Pikes Peaks times. 2 minutes faster than Vatanen and Röhrl were back in those days (they needed almost 11 minutes, you can find youtube videos with ~9:10 minutes without BS-corner cutting). It's sim, but more on the easy than on the hard side.
You'll just need to learn the hard way then
You are scaring the guy, man. You're right, but not a very welcoming formulation. He doesn't need to be born for this and can get as good as you and me in no time.
The game does not force you to finish in first place to progress. I'm usually very happy with a second place and if I fuck up and end up lower than 3rd, then I know whose fault that was (got greedy). There is also no shame in racing rallycross with lower AI settings. The AI is really hard in this game.
Not sure, if you're already doing this, but if I were to mentor a guy, I'd start with switching all assists off (for better car control and more options how to tackle corners; it's really important in a rally game), except for auto-clutch (that stays on for now), with shift-up on the circle and shift-down on the square button. Then go for some slower stages with lots of different corner types where the stage isn't too narrow (no asphalt, no ice in the beginning). Find a controller setup that is not too twitchy, in a rally car it's easier to fight understeer than oversteer. Play with the throttle, it's not an on/off thing here, a lot of times it's good to go 80-90% and have a little reserve to induce power-oversteer (at least when the road is not really straight).
If you're getting better, try and learn the stages a little. If certain stages or corner types are giving you trouble, ask here again. I'm sure we can help you. I'd also say a clutch is more helpful than a handbrake in a rally game, so once you're better, give auto-clutch off and "clutch on the cross button" a try.
And try Danowat's controller settings(should he post them), he's really good at finding some nice settings, I think.