I'm new to this jail breaking thing. What is a good jailbreak method that will gain me access to the Cydia app store? I have a Mac, so it needs to be compatible. If I unjailbreak it, will Apple store employees be able to tell it was at one time jailbroken? Can I still do all the normal functions and apps my iPhone has, like iCloud and such? I have a 4S running iOS 5.1. Please help me in as simple of a way as possible. I'm not amazing with my tech.