The kick from one shot
is not a big problem, even if it knocks you on your butt. But you have to remember that it takes LOTS of shooting to become proficient, assuming one wants to become proficient. And after the 6th or 7th, or 50th or 60th shot, recoil becomes a VERY significant factor. I can shoot my muzzleloader all day and it even has a metal buttplate. But a 12 ga.? Forget it.