Could be placed at beginning or end. Because of the nature of the game some details in the steps do not match 100% with the video, but all crucial progress information is completely accurate.
This walkthrough starts when you exit the elevator after the hallucination and ends at the end of chapter 1. Steps 8-26 of Triage Room in the text walkthrough.
This walkthrough takes you from the first save point until the cut scene in the elevator with the hallucination. Step 21 of Chapter 1 until Step 7 of Triage Room in the text walkthrough.
This video covers from when you start running (start of play) until the save point just after you acquire the plasma cutter. Steps 1-21 in the walkthrough.