From what I gather hitting someone with a headshot while getting flinched requires a couple things: patience, cool nerves & a little aim assist couldn't hurt. I've yet to master this, but I'm wondering what are some techniques snipers use to help develop this. At first I thought maybe I could work on this in pve but I think this only helps to a certain extent due to the stress factor being higher in Pvp. I'll look forward to your feedback!