it will be just the same as screwing air into any gun. after youve been screwing it for about 4 seconds you should hear a little bit of air escape then it will become harder to screw in but just keep screwing it in until it wont go any further
if you got a on/of make certain its of when you put the air in saves your o-rings then just screw the on in and it will make a little noise and away you go