Please keep in mind that the "Laydown" is one of those tricks that takes longer to teach. The amount of time it takes for the horse to learn it is a BIG RANGE
Part 1 shows you all the steps basically explained. This will show you what you're exactly looking for.
Part 2 is being recorded to show the laydown start to finish!
Part 3 will cover problems you may run into teaching the laydown.
Remember, this trick may take awhile for your horse to learn, but if you keep working on it 5-10 minutes each day you're horse will get it sooner than later!

Facebook/Instagram:
@vanfleetmustangs