I actually have my private pilots licence. Had bought a Piper arrow that was IFR rated. I am not rate IFR but my instructor was.

Flew one flight to a small airport during real IFR conditions with my instructor. Uses GPS for localizer and glideslope. This particular airport minimum was 200 feet. That means if you don't see the runway by 200, you abort. Anyhow the cloud layer was started at 5000 right down to 300 feet. Was beautiful day with zero turbulence. When we entered the clouds, it literally felt like you were not moving and just in a heavy fog. Your engine is even decreased and quiet as you are descending. You watch the instruments like a hawk because it is easy to lose spacial orientation and death comes shortly after that. The only really movement is watching your attitude decrease which is very eerie. Being we were flying into an unmanned airport, for all you know the clouds go right into the ground so watching for the abort attitude is critical. In this case the cloud layer was particularly low at 300 feet. We broke thru the clouds with 100 feet to spare before abort attitude. Literally about three seconds later we were starting the flare and landing.

You literally rely on your instruments 100 percent and hope that altitude indicator is right on. You have a minimum of two attitude indicators. If they were both to fail in real IFR conditions, conditions where you can't see the horizon, very few pilots will survive. You can't feel the horizon at all. There is no way to tell if you are level.On the ultimate failure, you can use slew, altitude, turn indicator, worried to try and fly out of the condition. But few pilots could successfully do that for any extend time.