The red string
For now, get the marks accurate the best you know how.
As for how to further transfer measurements. At this stage it is not done at a distance. Most of the work you will do seated. When you start refining you will look from a distance. This said, you will measure with a string wrapped around forefinger of left hand and forefinger of right hand using the thumbs as a slide and the nail on the thumbs as the measuring edge. Here is a photo to help explain. Think of the tape as a finger nail on the left and finger nail on the right hand.
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