Head gasket is DIY'able if you have a semi-decent array of tools. Only tricky part realistically is getting the timing chain pin out as you need a small slide-hammer or use a little ingenuity.

If you search my threads I have a ton of pictures from when I did mine.

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
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2003 Gray Mercedes ML350 - 122k