Study
Watch the following video and learn from it. Keep it handy to refer back to:
Drive
1. Enable TC (traction control) and ABS (antilock brakes) on high/full and SC (stability control) on low.
2. Drive for a few hours, a day, a few days - whatever - until you get consistent and comfortable and a general feeling of control and confidence with the car. A constant comfortable feeling though, not just the odd comfortable lap here and there.
3. Disable SC but don't touch ABS and TC yet.
4. Repeat step #2
5. Lower either TC or ABS (not both) by 1 level (e.g. high/full to medium).
6. Keep repeating step #2 followed by step #5. Eventually you'll have all aids off.
NOTE: If using the Aussie V8s then make sure to also enable, and keep enabled, autoclutch so as to have the car autolift and autoblip for you. If you want to be responsible for upshifting throttle lifts and downshifting throttle blips then disable autoclutch but for now I highly advise to keep it enabled.
NOTE 2: Make sure to not use vSync (whether from your GPU control panel or the game's options) as it adds input lag, on top of that, make sure to set max pre-rendered frames in your GPU's control panel (for Nvidia users) to 1 as that will lower input lag further. I also advise you to then go in your SCE player PLR file and look for the max framerate line. Set it to whatever number your monitor's max refresh rate is and SCE's refresh rate is set to. Make sure to put a negative sign in front of the number (-60, not 60, -144, not 144, etc.).
P.S. Feel free to add me on Steam. I'd be more than glad to go online and help you out (or just do some racing if not necessarily looking for help). That goes to anyone and everyone