Judging from the orange fruits on the tree next to the clump, you are not in the Seattle area. It's a pity, I could help you out if you were.
You need to dig out the perimeter pups, 1 or 2 at a time, deep enough preserve the corm and some roots, and work your way towards the middle. If you intend to grow them, either get some pots to plant them in, or prepare other planting sites where you intend to plant them.
Check out Jarred's step-by-step procedure for separating a pup in this thread: Time to separate the pups for the Spring
Granted that his illustration is for a single pup, and that should work for you if you want to separate individual pups. But if you want to just remove the clump, having 2 or 3 pups to plant in another spot would make your work faster.