Gameplay

My advice is to throttle with 'W' in your keyboard and to steer with left and right arrows. So you can have better control using both hands.

Most cars can be driven just holding 'W' and steering. No need to brake as every turn makes the car to slow down.

Difficulty

At start it looks a very hard game. You just have to test some cars and find one that suits to your liking.
It seems hard if you just play Single Races. The 'main rival' is ultra fast, doesn't slow down on turns, drifts a lot without remarkable penalty... and can make you go mad.

Tips

1) Find a car that suits your skills - Mine was #30 (13 in the sticker and yellow & green colors). There are others with similar responses.

2) Play Championship mode. The insane difficulty of - the single race rival - is a few steps down. You can save a lot of time, which I didn't, not trying to beat that crazy rival. xD

Other cars I liked that coud be good for completing.
#17 - #19 - #30 - #35 - #44 - #45 - #46