That is simple enough to crochet a hooded scarf.
There are several secrets of successful processing:
1. Top. During estimation measurements it should be taken into account that the scarf will lay down better by having lapels close to face. And it would be better if them have plaits at the edges.
2. It is necessary to add gradually several loops into the chain to increase the hood depth (I have added 9 loops). And then you ought to remove these loops carefully.
3. Try to crochet with rare stitches in order to your stockinet would be soft.