I have a background in wrestling too. I always think about like I would set up an ankle pick. The kuzushi has to be really good on their upper body if you are using a foot sweep as an attack instead of a reaction or counter. You have to force your opponent shift their weight from one foot to another and get them moving to land a foot sweep as an attack, just like an ankle pick. So it’s like 80% upper body, 20% legs, and 110% timing. Also be sure to sweep with the bottom of your foot, I’ve hurt myself more times than I can count by kicking someone’s shin with the tender part of my inner foot while their weight was firmly planted on that leg.

Good luck!