Ok chaps about to buy my first pcp and a 3 litre bottle, (bottle comes with a din fitting)

Im likely to get an s400,

How do i fill it guys,

Im assuming, i need to fit the adapter that comes with the gun needs tobe put on the hose first, with a spanner?

Then what,

do i cock the gun? how far do i fill it too?? how far do i open the bottle valve? whats the bleed valve??


Lee