There are few worse ideas in technical communication than the idea that procedures have prerequisites. There are no prerequisites. There are only steps.
To illustrate: Last weekend I paid a visit to some family members who were camping at a nearby campground. They were struggling to inflate the new air mattress they had bought. The mattress had an integrated foot pump, but no matter how they pumped, the mattress refused to fill with air.
Several of us took our turns trying. Each of us read the instructions and did what they said to do, all to no effect. The decision was eventually made to return the mattress to the store, and discussion turned to whether to go home or sleep on the ground.