I dont think you can know where to rotate the engine to release the tension on the VP before you pull it. Shouldn't be a problem, just be very careful with a bottom allen, its easy to strip out. On reinstalling the V/P line up the valleys "up and down" on the little "roller coaster track" of the timing device, that will mean the V/P will not be under pressure.

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"