Our chance to inspect our instructions before moving these pattern pieces and mixing their orientation, are there enough ? Yes, it seems complete for this example. As it happens that two of the sections are identical. Your sample needs to make sense to you. Have you written enough identifying features ?

The layout. The down proof ticking is trimmed to the size needed, but not yet cut into segments. The excess allowed is for seam allowance and for extra size. Trimming more next.

The rectangular segments need only be divided evenly. The rounded edge at right bottom must be kept the original size, nothing added. Why ? To add would restrict how the cushion fits over the sofa arm.

I labelled my pattern just in case I forgot, never add at an inward cut away curve.

Ready for final cut away.

It is now easy to see where excess is allowed. That margin of white around the peach is 1.25".

Now before I lift the peach pattern away, what do I need to label next ? Though my two rectangular segments could be interchangeable, to develop good habits I will treat them as though they are not interchangeable. I will also label the WS and RS, as once pattern is pulled away, I might be confused.