go about removing those glow plugs carefully - spray them with penetrating oil a few times starting a few days before you want to remove them. Work them back and forth as you are taking them out - if it starts to lock up - STOP, soak more and try a little heat, keep working it back and forth... your engine isn't like mine and should not have the issues mine does - but you can never be too careful.
I would replace all the glow plugs at once - and use a good brand like bosch or beru - don't use champion or autolite!

I would check suspention steering and brakes as well as wheel bearings carefully before putting into daily service....

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95 E300 Diesel 265k and counting