I think I have a much better appreciation of how accurate you have to be
for the biggest factor. In driving on the street, even when you "push
the limit", the chances are that you really don't push them that hard.
So it doesn't matter if you don't get the line through a corner right;
there will always be enough traction left over to compensate.
And in combination and support of that, a lot of it comes down to using
your vision correctly. At first, it's very easy to focus on the portion
of the corner that you're currently driving--looking at the turn-in
point until you turn in, then looking at the apex marker until you apex,
etc., but what you really want to do is be looking further ahead. As you
approach a corner, yes: look at your braking point, but once you're
actually there, you should already be looking ahead to the turn-in
point, so that your brain can judge whether or not you're really going
to get slow enough by then. Then once you've got to the turn-in point,
you should already be looking toward your chosen apex and before you
even get to it, you should be looking at that track out point.
When you do all that correctly, your brain can process whether or not
you've overdone a braking point, whether you can get on the power
earlier, or whether you need to wait, and so on.
>
> BTW, I'd really like to do this myself but am choosing not to be able to
> afford it. I just know I'd be all, I need a trailer, I need a new
> engine, I need new tires, and down the rabbit hole I'd go.
Preaching to the choir, here. :-)