I've just planted some in a container and have placed mine in a partially open potting shed with a large flowerpot completely covering the container, to keep out the light. The soil needs to be just damp. However, you may find your timing is out of kilter with the hyacinths as most of them, if planted now, will be about three or four inches high by Christmas, when you're away, full of bursting buds & green shoots and be more than ready to bring indoors to flower. And by this time they will probably be in need of watering, otherwise they will die. As Yvonne has suggested, probably best to give them to a friend to mind, otherwise you may be disappointed by your efforts.