My first time to but its not hard. It's best to backup your phone on iTunes. Then disconnect & reset by erasing all contents & settings. Then set the phone up as new. It'll be like it was out of the box. The jailbreak tool is called absinthe. It's available at greenp0ison.com for windows & Mac. Download it then extract it to desktop. A GUI tool will open at which time it will tell you to connect your iPhone 4s or iPad 2. Once you connect it should recognize & you simply click jailbreak. It will have a status bar & all that. When it finishes there will be an absinthe icon. Click on it & it will run whatever it does. After that there will be a cydia icon & click on that & it will run its thing. When it finishes you're done with the jailbreak. Oh yea may be a reboot or 2 in there so just be patient. Now the long part. If I didn't mention before make sure iTunes is set so it doesn't automatically open & run when you connect your phone. Go to edit > preferences & there will be a device icon. Click on it & it will have the box to click on & disable that. Anyway now you want to connect. & open iTunes then restore from the backup you had just did. It takes awhile. After that you're good. There's a ton of tutorials on YouTube.