All the above are very helpful, I would add.

1. If you assume that your audience knows nothing about cracking and the tools required, you will force yourself to write clear instructions.

2. Spell out clearly in your mind and then on paper the steps, don't exclude whats in your head, the person reading the tutorial can't assume anything.

3. If possible, add little notes to make it clear what your are talking about.
I have read tutorials before that assumes something a few paragraphs up, very difficult to follow when you dont know what the writer is intending you to look at.

Hope this is helpful, I applaude you on taking the initiative to write a tutorial and help out. Maybe before you post you can pm to somebody for review?

Thanks,
Dr Pete