sgtbrown26 wrote:I thought it was fine because the bishop authorized it.
You can (almost) never go wrong doing what your bishop asks you to do. At worst, since this was a stake calling, your bishop would receive some training, and it would be suggested that you get to know the Handbook (which you could not have done in advance anyway, so you needed to trust your bishop.)
Around here, the outgoing ward clerk would have been asked to help you with your new responsibilities (i.e., some training), and that could easily and quietly happen before you are sustained and set apart.
The Handbook (which we have been asked not to quote in this forum, but are allowed to briefly paraphrase) says that you should be sustained and set apart before you begin to serve. Based on that principle, the stake president can decide how much you should or should not do before that happens.
We have a slightly different challenge in our stake. Because of great travel distances, we have cases where a person is sustained, but some time passes before the proper person is available to set them apart. In these cases, the person usually begins to serve and the setting apart comes later.