Rooting a several months old phone is easy. The longer a phone has been released the more time the rooting community has had time to work on getting root, then they usually end up packaging the steps into an app you have to download outside of the Play store. Usually the OP will have a fairly clean description of what needs to be done.
The guides and files are posted on a forum with 20+ pages of "thanks yo'ur a god!" and "It didn't work, what do?". The OP it often named "sneaky1" or "SluttyDude". Usually I'll read the OP and the first and last 3 pages. The gives the pulse of the success.
This is really the only challenge; trust.