De-cap them. I would not bother with oiling to try and make them inert as you will then have to clean the cases to remove the oil. Gentle de-capping is very unlikely to set one off, but just in case, wear eye protection and wrap a rag around the press to contain any small sharp bits that might be ejected. Small pistol primers are not very energetic, and according to my personal experimentation they need either a sharp blow, or a very hard grinding action to set them off.
If your are worried then simply load them into your firearm and fire them off before de-capping. Suggest that you do this on the range or loosely muffle the muzzle with a thick rag. They are quite loud and will eject fast moving small particles from the barrel.
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