Poppy advice needed

Has anyone got any foolproof methods for success? Tried everything (module planting, sowing loads direct, freezing seeds first). Very poor results- almosy nothing coming up. For one of my plot neighbours they self seed and she had millions with zero effort- what gives?

I really need to go to specksavers, I keep reading this as “Puppy” advice needed! 🤓
I did as greenjay suggested and got a few from my plot neighbour. Only one took but now it reappears perennially, so hope it will be happy enough to self seed in years to come.
I have had good success with just throwing packets of Welsh and Californian poppies onto bare ground but those are definitely annuals.
Good luck wolveryeti!