I just got a new Iphone 3gs a couple months ago and im thinking of jailbreaking it. Its on the new 4.2.1 software, and its a newer model (new bootrom or past week 45 or whatever you use to identify it.) I already have all the software to jailbreak with redsn0w, so im pretty much waiting for the go-ahead from myself. so my main question is, how safe is it? is there a certain success rate or something like that? cause ive seen it done pretty smoothly on youtube but i dont want to leave anything to chance.