Ok, my fellow grapplers.
I have a question for you.
I have looked at several takedown clips, and have come to the conclusion that I would have no idea what to do if smoeone came shooting at my legs to take me down.
I had a friend put on a head cage and asked him to come and take me down, and bar a VERY well timed elbow to the back of the head there was not much I could do. The knee to the head is a bad idea because then you give him one of your legs as a christmas present (tried it).

So... how would you atempt to stay on your feet? I realise that you can do a sort of counter takedown whilst you are being thrown to make sure you are the one that lands on top, and I know how to defend against judo takedowns. But I would like some advice on how I would stay on my feet.
What are your weakpoints that I could exploit?