I have recently acquired Walther SSP and getting to know the pistol and how to operate it. I have read through the manual and it does not explain how to decock it, once i pull the slide back and release it firing pin will be cocked and dry firing is not an option. Can anyone tell me how to do it safely if I don't have a dry firing insert for SSP? I read somewhere that you can pull back slide and release the trigger to decock it to prevent the firing pin hitting the chamber. Please advise, thank you!