Hello: I did install an early cloth headliner in my 1960 Amazon-S (that I bought in Holland also) with the help of an experienced bodyman. We still had great difficulty and it will never be perfect. We must have spent 3-4 hours inside the car, with many false starts. We started with the back retainer strip, but I've heard we should have started from the front. The secret is to ensure that the tension wires are in their proper position and inclination. Volvo recommends a special tool to hook the fabric onto the toothed rail, but if you have a plastic rim on the headliner, this may be easier. My headliner comes out of the rim near the package tray, so I've obviously done something incorrectly. Unless you have patience and an extra set of hands, I'd pay to have it done professionally. Maybe after doing 3 or 4 of these, you could become proficient enough, but you risk ruining the headliner or always kicking yourself for not getting the job done properly. Of course, if this is your daily driver, then I guess you could accept a less than perfect installation job. If you do get it done professionally, take some notes and take pictures to help enlighten those who went for the "do it youself" route.
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Cam a.k.a. CVOLVO.COM