Francoise wrote: Tue Sep 05, 2023 3:44 pm
When I did the first exercises -shading the house model, for instance - I found it almost impossible to go as dark as the demo.
Did anybody run into the same issue?
No.
Oh, you wanted more?
...there's no way I can draw THAT dark squares with a 4B pencil... I filled in the squares with the flat side of a chisel point. Since I could achieve - at best - a midtone grey - I tried adding additional layers with the sharp side. Still no luck.
That surprises me. Usually, the flat face with as much pressure as I think is required, does the job. Then, if necessary, I use the edge. And that
really gets into the tooth. But I do use a 2B in those demos, which might make a difference.
Might I suggest you try experimenting with blacks before you return to the erasing? Just grab some paper, like your Canson, and then try to destroy it.

Seriously, you need to know two things: how much pressure you need to apply to obtain different values; and how much pressure your paper can stand before it breaks up.
Also - and this is important - do have a smooth and hard surface directly under your paper. If you're using a pad, or more than one sheet, much of the pressure you apply will be lost when the paper sinks into the sheets beneath. A hard, smooth surface will ensure ALL the pressure is applied.
Post an image or two of what you've managed so far, and maybe we can help more.