Separate explanations from steps
A common vice among procedure writers is blending chatter with instructions, explaining a few things at the same time as issuing an instruction, or even putting an explanation in the same format as a step, so someone tries to act on a description.
When explanations are entangled with instructions, everyone--beginner and expert alike--has to slow down to figure out what to do.
You confuse people.
Most people expect that each step will contain an action to perform, not a concept to understand, or a comment on the action.
