I have deprimed many cases and have always just run the unfired primers thru the die. If all you want to do is deprime, set the die a little high and extend the depriming pin a bit so you don't resize the case. If you run it all of the way into the resizing die without lubricant you will get a case stuck. The bullets may be a bit loose without neck sizing, but in a single shot this won't be a problem by itself.
Always wear safety glasses when working with primers. I had one or 2 go off a long time ago while seating primers (don't remember why). Besides being a hazard to the eyes, it is very loud!