Choose the line width
Fine tips suit small grids and detailed transfers, while broader tips are easier to see on large patches or dark cloth. The line should not be wider than the stitch field can cover.
Make a few marks beside the actual pattern. A tip that feels precise on paper may spread along the fabric grain.
Test removal properly
Wash, dampen or erase the sample using the method you will use for the finished object. Let it dry fully and check in daylight for a shadow or colour shift.
Test both a fresh mark and one that has sat for the expected project time. Some temporary inks become harder to remove after heat, light or long storage.
Use the marker lightly
Draw a clear guide with the least pressure needed. Repeatedly tracing a line can force pigment deeper into the cloth and make removal less predictable.
Keep the cap on and store the marker horizontally if the instructions recommend it. Replace a dried or damaged tip rather than pressing harder to make a fading line visible.