That blue line id remove everything including buds below that line. If removing your exhaust is an option for you id do that prior to everything else to give you more head room and less youll have to remove from her.
This is a link to one of my current grows that has some LST examples that may come useful in the future. Tents are limited in height so this allows you to grow horizontal and get better lighting coverage without needing 10’ ceilings