DONT PUSH IT or you wont make it back home in 1 piece with your car. This track cannot be compared to others, tons of blind turns and it keeps going and going. Also the height differences can seriously upset the suspension and the traction in some corners. I know there is 1 corner there (dont know all the names by heart, could look it up) where if you push it a bit and you let go of the accelerator only a little in a RWD car you will find yourself facing the wrong side of the road because of the road going up / down in that corner.
Also if it is your first time dont go in a weekend, or certainly dont go in a holiday weekend (like easter or sth) because, and i am sorry to say this and dont get offended here, the ring at that time is infested with Brits that seem to have lost a few nuts 'n' bolts in their head on the way there
And something very important. If you can (and you should) take someone with you who knows the track very well to be your co-pilot to guide you over the track. This will allow you to have a bit of fun without having to do 30 laps on your own first wondering where the lines and the braking zones are.
About accidents, indeed that could be costly. I saw an Englishman last year who crashed his porsche into the armco, thought he it was "ok" and continued his lap. What he didnt realise was that he had an oil leak on this car. He spilled oil for over 2km before his car completely broke down, in the mean time taking down quite some motorcyclists who slipped on the oil. You can imagine this being a public road and the police coming at each accident (and therefore it being his responsibility) that he will be presented with a nice bill (ring closed for an hour, cleaning up of oil over 2km, armco repairs, probably some fine for continuing driving after crashing his car, damage to motorcycles, and the damage to his car ....).