HI davelovejoan,
Yes, difficulty can be in the cloth. And yes the larger the number is more of a challenge. However, other challenges include
the color of the cloth you are stitching on (black is a challenge)
If you are stitching over 2 threads
The number of pages to your pattern
The number of colors in your project
The stitches can be 1/4 stitches
The size of you project. Some finished projects are huge
What pattern(s) are you considering. We stitchers like to share what we are working on, considering, or have in our stash.
Happy stitching