Youtube should help. Look for headgasket replacement and so on. You may not find your exact model, but it will give you an idea of whats involved. Once you have an idea you should also get a repair manual for a detailed list of things to take off. Also, depending on the problem, you may need to have additional work done to the cylinder head once it is out of the vehicle. So if it was an overheating problem, it may have warped the head, sometimes this requires a machine shop to "shave" the head back perfectly flat before re-installation.
Fig. Cylinder head bolt loosening sequence - Altima & Maxima 3.5L engine
Install the cylinder head bolts and torque in sequence as follows:
Fig. Fig. 9 Tighten the cylinder head bolts in three steps using the sequence shown-4.6L and 5.4L engines
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