DIY headlight Alignment?

[LoopyLouisa]

Hi

I've recently brought a 89 laser GL hatchback. Although the dealer provided a RWC the headlights point down at the ground and I cant see very well (I thought they had to be correctly aligned to pass?) I've found the screws to adjust but whats the best way to align them properly, I've heard of methods like putting crosses on a wall etc etc. Can anyone give me more detailed instructions?

Thanks
Louisa