I've knit the BYL scarf and I understand what you mean by being mislead by what is written. Just follow the chart & u will do fine. You will see the border that she is referencing as u continue in the pattern it's created as u work the 1st 3 sts in the chart. As long as you follow the chart you will be fine.
I took my book to Kinko's and had the chart size increased, then I highlighted the knit rows & left the purl rows blank. I also made an enlarged copy of the key for the chart symbols & taped it in my knitting notebook so I could reference it when needed. Oh, and I use a magnetic board & always have a magnetic strip above the row that I am working on which makes reading the chart much easier, the same can be done with a post it or somethin...it's just a tool to help me keep my place
Have fun, it's really fun to knit