Whatever you do, make sure you back up your i Phone's data before you start just in case something goes wrong.
You should always be on the alert for malware attacks.
(Brand-new versions of i OS generally cannot be jailbroken for some time after they come out.
Jailbreakers will work hard to find a way to get round the new safeguards and restrictions that have been placed on the new software.) There are plenty of instructions and resources online that can help you.
Heck, you can even set them to be the default apps if you want, enabling you to ignore Mail, Safari and Apple's other apps altogether. While many great alternatives to i OS's default apps do exist, you'll find that i OS always reverts to the defaults for certain things.
Try clicking on an email address or a URL in an app, a document or web page and Mail and Safari will almost always boot up first, no matter which other alternatives you use.
It's a slightly different scenario with friends and family.