Any tips? Straight edge to check across the joists, work slowly etc.
It will be easier in a tight space to either mark it with a chalk / ink line, or just put a string line across either side and plane to that.
Legend. That makes loads of sense. Currently fannying around with my laser level trying to make sense of it. String sounds much better.
I owe you a beer or two after this!
@Nef started
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It will be easier in a tight space to either mark it with a chalk / ink line, or just put a string line across either side and plane to that.