What is Reddit's opinion of Helix Circle Stencil Template, Translucent Orange?

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Place one of the holes on one of these over the nose cone and paint up to it.

https://www.amazon.co.uk/Helix-Circle-Stencil-Template-Translucent/dp/B00290KWWA/

Also, happy cake day!

Lead hardness - to a certain extent it depends on what paper you will be using, what sort of drawings you will be doing and importantly what you like using. Also lead composition and grading systems do not seem to be the same between different manufacturers.

To explain one of my processes: (Accurate drawings are produced with CAD) With freehand drawings I don't use technical equipment but only sketch on white paper with an automatic pencil (0.5) using 2B lead. I then put tracing paper over the white paper (taping it down with paper/masking tape) and trace over the lines below using fiber-tipped pens (ex. 0.1, 0.3, 0.5, 0.8). Tracing paper comes in different weights/thicknesses too: use a thicker paper as it is more tolerant (the humidity/heat from your hand won't buckle it)

When I make a mistake with an ink line I use a razor blade to erase the line. There is no particular technique to this - use a with a double edged razor as you can give it a slight curve between fingers and thumb. The finished drawing is then scanned. In the computer it can be tidied-up and coloured using Inkscape or Gimp.

With the caveat that I don't know what type of drawings you are doing - you may find it easier to start drawing freehand with pencil on gridded paper and then, with tracing paper over that, draw in freehand or freehand-ruled with fiber-tipped pens.

Also - for circles you will need a compass and pen attachments or more useful for you would may be a circle stencil. For curves you'll need ship/railway/french curves.