after you remove the intake manifold,
get under the car, unbolt the two nuts at the main
exhaust collector (connects to the catalytic converter).... soak these two nuts in Parts Blaster for a day or two in advance. For me, one of these two nuts was *very* difficult to remove. I also needed about 2 foot of socket extensions.
Then you remove the heat shield and exhaust pipe that connects the front exhaust to the rear.
Disconnect the egr tube, disconnect the O2 sensor, and various brackets, ignition module, etc... then you can remove the heads.
For the rear, you can leave the exhaust manifold on the heads. I highly encourage this!
AFTER REMOVING THE EXHAUST HEAT SHIELDS, SOAK ALL MANIFOLD STUDS/NUTS IN PB BLASTER OVERNIGHT. Don't be tempted to continue disassembly or you will break off frozen studs.... I lost two that way.