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Thanks. Not that hard, but it takes a lot of time, and a place with not that much light pollution. A tripod, 15 to 30 sec of exposure and few spare hours to take photos. then you could find photoshop action, or a program for star trails stacking. after that it could be finished or you need to do some work in PS. I had 4 shots in that 250 that i used flash to light the church, so it needed some work after the star stacking.
Must say it was an interesting experience, lying down in front of something build 800 years ago, looking at the stars in the middle of nowhere :)