This is a written how to do for a non-turbo:
https://www.matthewsvolvosite.com/how-to-replace-the-head-gasket-on-a-volvo-850/
And of course there is always Robert:
https://www.youtube.com/watch?v=b_XOdjgxn9A
While it is difficult as a DIY project, it is not impossible. You will need a cam locking/hold down tool because of the VVT's.
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Please, please, look for a coolant loss other than the exhaust. A pin hole in the radiator, a pin hole in the line to the turbo, a leaking connector in the firewall, etc. BEFORE attempting a head gasket.
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Keeping it running is better than buying new
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