> I think it probably needs to have a few frames pulled and processed to get the times right because of its age

You won't know if it needs to be pushed/pulled unless there's a note saying to do so (if there's any notes left with the roll, or something marked up on the film canister). Most photographers who do push/pull their film also mean to do it to their entire roll, so there's no point to do it to a few frames (and you also can't do it to just a few frames - you can't really cleanly cut up a roll of undeveloped film as you don't know where one picture ends and another starts, so you'll almost certainly just cut through the middle of a picture. You won't know until it's developed, and once it's developed it's too late to push/pull, though you can correct the brightness digitally to some extent)