hey, i have an iphone 4 on at&t and have never even thought about jailbreaking before, but today got a wild hair and have thought hard about trying. i'm totally new to this and have no idea what i am doing so any help on what to do would be helpful and also...what happens when i jailbreak? is the app store still there and i'm able to download apps from there? can i still sync with itunes? how does the tether app work, what's the cost of it? basically, i'm just worried i'm going to mess up and lose my phone. any help is appreciated! thanks!