Indeed, as Marc says, wind as far as the hook and then feed it in with some brass tweezers.
It is also advisable to remove the tension by turning the crank backwards, maybe two turns. And this is because when you feed in the hook, sometimes the hook will slip all the way around inside, and then back out of the gap and then catch. If you reduce the tension first then this will not happen. If you reduce the tension too much so that you can't push the hook through then you can always crank it up a bit.
Hope i'm being clear :)