We recently purchased our first home and have about an acre of yard. The lawn needs A LOT of work, it is comprised mostly of weeds. This weed in particular is immensely painful to walk on. After a few steps in the yard I had to pry the burrs from my feet and cover them in cortisone. In 2 weeks we are hosting a backyard get together complete with slip and slide-we can't have kiddos or adults running around on these awful weeds. What is it? What can I do to get rid of them in our large yard on this timeframe?? Thank you so much for any insight! Very new to the yard/gardening world.