i got really discouraged trying to go from 2->0, and just left it alone for a few years. The difference in size is a lot, way more of a jump than anything previous. All the others I just sized up and left in for a month or two, then I was able to easily wiggle something larger in. I did wear fairly heavy metal jewelery though.
But trying to stretch to 0 from 2 just isn't happening in one go for me, so I started taping up some black plugs kinda like that a few weeks ago, a round or so every couple days. so far so good. im not sure if I'll go past 0 though, as I might eventually have to take them out for career reasons (god damnit).
I really don't want to tear anything (if bleeding you went too fast and might scar, which won't stretch properly) though, so I'm going agonizingly slow.