What do you do to replant a pot of daffodils or hyacinths, do you let the soil get dry?

Here you go.

This one is for hyacinths.

I would say no to letting them dry out. Water them thoroughly so the soil will hold together for transplanting. Transplant as much of the original soil as you can and make sure you dig the hole large enough to accommodate the root ball (or bulb ball, in this case). You may also want to put some good grade fertilizer in the hole before planting, or you can use some mushroom compost to boost the blooms.