Jailbreak Ipad 2 queries?

jailbreak ipad 2 queries?

What’s the worst that can happen. I heard that you can loose your warranty. I purchased an extended warranty on my ipad 2 for about a year or so. Can the jailbroken device be reversed so no one can even tell it was jailbroken??? The reason I wanna jailbreak my ipad is because I am 16 and don’t have a credit card, so I can’t get the best apps.