Audience. Notice that these instructions very carefully define what skills the audience needs to do this task. Do you think this is enough?
Overview. Notice that these instructions carefully outline the main phases of this task, using the in-sentence list format. Notice that both parentheses are used on the numbers.
Equipment and supplies. Like many other instructions, these list the equipnment (tools, nonconsumable items) and supplies (consumable items such as nails or screws) that you must gather before beginning the task. Notice that a bulleted list is used, rather than a numbered list: after all, these items are in no necessary order.
Special notices. Scroll through these instructions to see the special notices that are used. Notice that only one caution is used. Remember that cautions are used to alert readers to the potential for minor injury. Do you think other special notices should have been used here?
Main headings. Notice that the headings used in these instructions are second-level headings, as defined by the online textbook. The heading "Equipment and Supplies" is not parallel in phrasing with the other headings which use gerund (-ing) phrasing. But that's okay in this instance.
Lead-ins. Notice that every numbered or bulleted list has a lead-in, a phrase that identifies the contents of the list. Notice too that each list item reads grammatically with the lead-in.
Lists. Notice that the instructions use numbered lists while the list of equipment and supplies uses a bulleted list. That fits the basic rule on lists: numbers for items in a required order; bullets for items in no required order.
Sublists. Notice at this point in the instructions, a sublist is used to present two different ways of doing something. It is a bulleted list (not "a," "b," and so on) because these two items are not a sequence (should not be performed in order).
Telegraphic language. One of the crazy tendency of instruction writers is to leave out article such as "the," "a," and "an" -- which is known as "telegraphic" language. In general, these instructions do a good job of avoiding telegraphic language, but there is one little spot where articles are omitted -- see if you can find it.
Imperative writing style. Notice how the individual steps here use the imperative style of phrasing (open this, aim that, click this, and so on). This is standard with instruction-writing. "You" is also commonly used. The idea is to get the reader's full attention.
That completes the comments for this example.
(Last line.)