You know what constitutes as a good 'dig'? Imagine using your little pinkie, with its fingernail at its optimum length; not too long nor not too short. As you dig around, you feel the moist booger in there is ripe for digging. You move your little fingernail around, until it finds a grip in the hardened parts of the booger. And then, you slowly pull/'dig' it out, in a firm fashion. You cannot pull too fast in case the booger breaks and leaves you a yellowish slime hanging at the opening of the nostrils. So, you pull gently at first, until the hardened part starts to dislodge and suddenly, you realise you have hit paydirt...