I've been using it for several years and, yes, that just about sums it up.

The important points are

1) it needs to be in contact with the ground, hence the scarifying.

2) it likes light, so don't try to grow it in the shade, and don't let it get overshadowed by grass in the early part of the year.

If you're buying seed, you can sow in spring, but don't try to keep the seed over to the following year. It is of course an annual, so until you've got it well established you may want to collect seed and replant it yourself rather than relying on nature to take its course.

It seems to have a particular liking for cocksfoot grass.

It's not the only semi-parasitic; lousewort and red bartsia are others. But lousewort likes much damper ground.