If you can get it down to the LIM gaskets, you can handle the heads. As the push rods have to be removed to replace the gasket, about all that is left is the exhaust manifolds, and head bolts. You'll want to take the heads to a shop to have them checked. If they have to be machined, that can add to the cost.
As long as the crank bearings haven't been damaged by coolant, and the time and effort is worth it to you, it may be worthwhile for you to try. It will also give you a bit more experience.
Black 2000 SSEi, Silverstar Headlights, Angel Eyes fogs, 3rd brake light overlay, hi-flo cat, drilled 180 degree thermostat, Intense FWI, PCM, shift kit, and 3.4 Pulley. Solid front mount.