Here's why:
* Wiring Complexity: The underhood fuse box has numerous wires connected to it. Carefully disconnecting and reconnecting these without damaging them or forgetting their placement is crucial. Take pictures or make a detailed diagram *before* you start disconnecting anything.
* Access: Depending on the specific location of the fuse box and any surrounding components, access might be somewhat limited. You might need to remove or loosen other parts to get a clear working space.
* Grounding: Proper grounding is essential for electrical systems. Ensuring the new fuse box is correctly grounded is vital to avoid problems.
* Identifying Wires: While many wire harnesses are color-coded, correctly identifying each wire and its proper connection is essential. A wiring diagram (available online or from a repair manual) will be very helpful.
* Potential for Damage: Improper handling can easily damage wires, connectors, or the fuse box itself, leading to electrical problems.
What you'll need:
* A repair manual specific to your 1996 Chevy Silverado 350. This is absolutely essential.
* Basic hand tools (screwdrivers, possibly sockets and wrenches depending on what needs to be moved for access).
* Wire connectors (if any are damaged during removal).
* Patience and attention to detail.
In short: If you're comfortable working on cars and have some electrical knowledge, it's a manageable job. However, if you're not comfortable with automotive electrical systems, it's best to leave it to a professional mechanic. The risk of causing further damage outweighs the potential cost savings for most people.