The hardest part of changing the plugs is getting the dust cover off. Torx screw driver, forgot which size, and remember not to over tighten when you put the cover back on.
Because the plugs are very deeply recessed, get a 6" or 8" extension on your ratchet.
I use Volvo plugs in my turbo. Never use multi-tip platinum plugs, they have a habit of loosing on of the tips which can then lodge between the valve and the head! Bang!!!
Three torx screws hold down the cover in front of the windshield (prior to 2001) and then you can just reach in and replace the filter. Passengerside.

Klaus
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(V♂LV♂s 1995 854T, 1998 V70R)

Both easy...should be able to use your old spark plug socket. I personally use the carbon activated cabin filter (www.fcpgroton.com) and even though turbo, the Bosch Coppers (avoid the platinum's at all cost) and just change them more regularly. You don't have any issue with these. If you want to stay with Volvo's, then get their spark plugs. Groton has all of these at a pretty good discount.
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1998 S70 T5 Emarald Green Metallic, 2004 V70 2.5T Ruby Red, Previous Owner of Black '94 850 Turbo Wagon. My cars have been running so well lately they've got me worried.