Video link at end...
So I've had this problem for decades. Had "surgery" several times over it.
I just got this tool yesterday, and the results were instant. I'm "wearing" it right now despite not being in pain, it's going to be my nail re-shaping regimen...
I'm doing it my own way - I don't have a hair dryer, and the whole soaking thing is too inconvenient. I just put it on and VERY gradually increase the tension every few minutes and let it sit there...
I got it from some site called "banggood" for 3 bucks and with shipping it came to like 5 bucks.
Best 5 bucks I've ever spent in my life...
https://www.youtube.com/watch?v=77_XpOOmkRk