Yes, it's not too bad, you need the right sockets and extensions for getting the valve cover off and some way of rotating the engine (not by the cam sprocket bolt!) I did use the bent wrenches exept on the exhaust valve on #5, the wrenches would either hit the fire wall or the cam tower, would have shortened them a little but they are a friends. Make sure you have the correct specs for the valves, they are different for turbo/non turbo. Do some searching and all will be answered....

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'84 300SD veg-oil bliss
'83 300SD veg-oil beater