I personally don't bother with autographs when I go up there (get them through other means, don't have to deal with lines). From what I have gathered over the years it's fairly easy if your willing to wait in line. Here's the info from the official Steeler site....
The best time to obtain autographs from the players is after practice and it's at the players discretion as to whether or not they sign on a particular day. There are areas designated for fans to stand to obtain the autographs. There is no formal setting for player autographs on a daily basis. There also will be an opportunity to obtain autographs before practice only on August 2 at the practice at high school fields. Please see information above for details.