I don't usually carry a pump, I take 3 C02 cartridges plus inflator. I prefer the push on inflator that just lets the whole cartridge contents into the tyre in one go (can't see why you would want to do anything other than this and the ones with the adjustable valve look a bit fiddly to me, so presenting opportunities for things to go wrong). Yes, try to keep your fingers away from the CO2 cartridge when inflating, ok if you just hold the inflator part, I did once end up with the cartridge frozen into my hand.