Maybe not the best tip but it helped a couple of my friends:
Take a couple of cars to the Fuji track (no gravel beds) and start abusing the hell out of the cars. Might sound funny but after a while you start to get a feel for what is going wrong. Getting understeer, oversteer, lockups...
The most important thing is understanding what is going on. From the moment that you understand what happens/is going to happen when the car oversteers etc. you will also understand the things you can do to prevent it while you are driving.
Questions you will find answers for:
How to turn this understeering car?
How can i best accelerate with this hugely oversteering car?
Can i brake a bit later than this?
What happens when i lift off in this high speed corner?
Can i drive, take a call on my mobile and drink at the same time?
(last one might be a tad bit too much ;-) )
So while you are abusing your cars in testsessions like that and meanwhile understanding what is happening to the car and why, one more thing will happen and that is you will learn how the game communicates these very situations to you, the gamer.
Taking all these things into account, you will -eventually- get to grips with driving without aids.
Just to clarify this "tip": I told a couple of my friends to do this (was for rFactor but theory is the same). Now I started driving sims back in the WorldCircuit/GP2 days without aids so I consider myself "experienced". One of my friends - who never raced any sims - now drives without aids and races my socks off on a regular bases, not that I am a gifted/brilliant/talented driver or anything but still... his standard of driving has been completely changed from NeedForSpeed-arcade racer to sim racer.
I'll leave you with one thing:
http://www.drivingfast.net/
Definitely a good read.
Good luck! Keep us posted on your progress.