Important Considerations:
* Severity of the problem: Is this a preventative measure or are you experiencing symptoms like coolant loss, overheating, milky oil, or loss of compression? The extent of the damage will influence the complexity of the repair. If there's significant damage to the cylinder head or block, a gasket replacement might not suffice.
* Mechanical ability: This is not a beginner's project. It requires a good understanding of automotive mechanics, the ability to use specialized tools (like a torque wrench), and patience. If you're not comfortable with complex engine work, it's best to have a qualified mechanic perform this repair.
* Tools and parts: You'll need a comprehensive set of tools, including sockets, wrenches, torque wrench, and possibly specialized tools for removing and installing the cylinder heads. You'll also need the correct cylinder head gaskets, head bolts (often recommended to replace), valve cover gaskets, and any other seals that need replacing (cam seals, etc.).
* Potential for further damage: During the repair, there's a risk of damaging other components. Improper torque on the head bolts can lead to warping and further problems.
In short: It's *possible* to replace the cylinder head gasket and seals without replacing the entire engine, but it's a demanding job. Weigh your skills and resources carefully. If you're unsure, seeking professional help is strongly advised to avoid costly mistakes.