how hard is it to install a head gasket on 1993 land cruiser.

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are there any free step by step instructions online to install a head gasket on a 1993 toyota land cruiser. lots of steam out of tail pipe, oil looks like choc. milk shake.keep adding antifreeze but ends up after driving in the oil.its been doing this for six months ,but now its much worse .i have read the reviews from blue devil and dont want to try it. i replaced a head gasket on my strait 6cyl truck .years ago. think i want to try the land cruiser, thanks for any helpful imfo.