A free wellfare servant, plenty of salt, and a bunch of stuff to grind. Let's go!
Re-rolling is a straight forward process in FGO, but you'll need time and a good WiFi connection if you're set on chasing those SSR characters.
If you're looking for a way to kill your attachment to this game, this event might just do the trick. It's frustrating enough that you're bound to be filled with salt even if you manage a good clear time.