The problems that I see with it are threefold:
1) In many states, only sworn personal can even look at child porn cases. That may be a legal issue right there for both you personally and the SO for letting you even look at the evidence.
2) Not having been trained in evidence handling procedures, ANYTHING you do is subject to question by the defense. Yes, the defense can and will question anything done by someone who's been trained, but when they have been trained, saying that they've been properly trained and followed standard and established procedures on the evidence goes a long way in credibility with both the court and a jury.
3) Even if this is case is legally OK for you to proceed on, never having testified or been trained in testimony, you'll likely have your a$$ handed to you on cross examination. Have a couple of the veteran deputies who have testified multiple times in actual trials do a "mock trial" with you, so you know how nasty cross can get.