I have just invested in a new marker and will be hopefully venturing out on my first walk on day. But I don't know what to expect. I've got no way of testing my marker b4 I go there so I'm worried that I'll go there only to find my kits failed on me. Also what to I do about cronographing my marker and gassing it up will they do it for me?? Can someone who's been b4 to an open day tell me what to expect and what kit I'll need apart from the obvious Marker, Hopper, Gas etc.