General Steps (with important caveats):
1. Safety First: Disconnect the negative (-) terminal from the battery before starting any work. This prevents accidental shorts and electrical shocks.
2. Consult a Repair Manual: A repair manual specific to your van's year and engine is *essential*. It will show you exactly where the plugs are, what tools you'll need, and the proper procedure. A Haynes or Chilton manual is a good investment.
3. Locate the Spark Plugs: This is the most engine-specific step. Generally, they're on top of the engine, but their exact location will differ. You might need to remove parts like the air intake system, various hoses, and possibly parts of the valve cover to reach them.
4. Remove Components: Carefully remove any components obstructing access to the spark plugs. Take pictures as you go to help with reassembly.
5. Remove Spark Plug Wires: Carefully disconnect and remove the spark plug wires one at a time. Note their order to avoid confusion during reinstallation. You might want to label them with masking tape and a marker.
6. Remove Spark Plugs: Use the correct spark plug socket (usually a deep well socket) and a ratchet or wrench to remove the plugs. Avoid stripping the threads. A spark plug socket with a rubber insert will help grip the plugs without damaging them.
7. Install New Spark Plugs: Install new spark plugs, ensuring they are tightened to the manufacturer's specified torque. Over-tightening can damage the threads in the engine block. Again, your repair manual will provide this information.
8. Reassemble: Carefully reassemble all components in the reverse order of removal.
9. Reconnect Battery: Reconnect the negative (-) battery terminal.
Without knowing your specific engine size, I can't provide more detailed instructions. Please check your vehicle's identification number (VIN) and find your engine's displacement (e.g., 4.3L, 5.7L) to find a suitable repair manual. Then, follow the instructions within that manual. Attempting this without a manual can lead to damage to your engine.
