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Yves --
This isn't really an easy question. It is definately a DIY job for some people (me), but not for some others (my wife).
You'll need to drain the antifreeze, disconnect the exhaust manifold, unbolt (and pull back) the intake manifold, and pull the timing belt. You'll also have a few small hoses and electrical connectors -- make a sketch of what goes where.
About to only special tool you'll need, beyond a complete set of metric sockets and other ordinary hand tools, is a good torque wrench.
The exhaust manifold definately stays ON the head -- separate it at the exhaust pipe flange.
If you're only changing the gasket, the cam stays in the head. Don't mess with shims and adjustments unless you do a valve job, which is not commonly needed in Volvo's OVC engines. You might, however, ask a machine shop to check the flatness of the head, and perhaps take a very light cut off the head -- no more than a few thousandths. This would provide a fresh surface for the new gasket.
This is the right time to change the timing belt, water pump, and front seals.
Be sure to clean the passage (adjacent to one head bolt, but I don't remember which one) that delivers oil to the cam.
You should have the head off in 2-3 hours, and reinstalled (taking your time, of course) in 3-4 hours.
Get a manual -- if nothing else, it will have the needed tightening torques and pattern.
You may also decide to replace the big plug in the back of the head. This might be a great time to install a retaining strap.
Why are you changing the gasket?
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