what a good length to cut off each side?
Whatever width feels comfy. Cut off a little at a time because you can't stick it back on. Personally I'd start off about 48 - 45 cm wide and keep nibbling off 1 - 2 cm from each end at each end every day or so until you find a width you like.
and does a normal hacksaw do the job?
Yes.
@TheBrick(Tommy) started
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Whatever width feels comfy. Cut off a little at a time because you can't stick it back on. Personally I'd start off about 48 - 45 cm wide and keep nibbling off 1 - 2 cm from each end at each end every day or so until you find a width you like.
Yes.