How do I get rid of stickers in my yard?

ha! i read your post, and thought to myself.... "just pick em up!!!" thinking like paper stickers.... can you tell i'm in the middle of toddlerville?

there are so many plants that can produce thorns and stickers most are broad leaf plants that you can kill with out killing the grass but it will take time.

there are things that are a spray on broad leaf weed killer that you need to apply when the weed is activly growing these products are like a 2-4 D and this will not kill your grass if used correctly but you will still have the thorn seeds that the plant has produced. you can try to get them up with a lawnmower but that may not work. you can use a preemergant to prevent them from germinating but you still have the seeds. or you can let them germinate and then kill off the weeds as they sprout before they seed. this may take a long time depending on the quality of the seeds and the time to germinate.
Getting rid of the source plants if first then try to get rid of the seeds .