Many people have issues dealing with Kaparot. Why waving the chicken over the head in circular motion and slaughter it afterward?
Please use the link below to read explanation and understand the process and the reason for Kaparot.
You can also find explanation on the Kaparot ceremony on Chabad website.
There are customs of doing Kaparot with fish or with money then give it to tzedakah. We use chicken and follow the customs taught to us by the Holy Ari.