Copperplate calligraphy paper, A4
Copperplate guides on A4, at the steep 55 degree slant and the tall ascenders the hand requires.
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Fifty-five degrees, and closely spaced guides
Copperplate leans far more than italic: about 55 degrees from the horizontal, which is roughly 35 degrees off vertical. Holding that consistently by eye is genuinely hard, which is why copperplate guide sheets carry slant lines much closer together than other hands need. The guides here sit at 1.4 x-heights apart, close enough to check every stroke against.
A pointed pen, not a broad edge
This is the structural difference from italic and blackletter. Copperplate is written with a flexible pointed nib, and the thick strokes come from pressing the tines apart on the downstroke rather than from a fixed nib angle. That means the stroke contrast is under your control at every moment and depends entirely on pressure. It is also why copperplate is unforgiving: an inconsistent hand shows immediately in the stroke weight.
Tall ascenders are part of the proportion
Copperplate uses ascenders and descenders substantially taller than the x-height, which is what gives a page its characteristic airiness and looping rhythm. Ruling them too short is a common way to make correct letterforms look wrong. This sheet sets them at 1.4 times the x-height, and the proportion is adjustable if you are working from an exemplar with a different one. The italic sheet is the broad-edge alternative.
Printing it accurately
This only measures correctly if your printer doesn't rescale the page. In the print dialog set Scale: 100%, not "Fit to page" or "Shrink oversized pages". If you're not sure it worked, print the calibration page, measure the ruler on it with a real ruler, and it will tell you exactly what your printer is doing to the page.