I just try to fix anything I can.
I hate to just replace modules.
In my case I need to repair one of the USB ports so I just ended at this step.
I simply skipped this step and left fan wire connected to logic board. Just unscrew screws from Step 6, put fan on the logic board and remove whole stuff togheter.
THIS WHOLE GUIDE IS TOO LONG AND FOR COWARDS. You can easily make it faster. Just do it as in guide until you finish step 4. Then open your laptop and put it on the table this way that keyboard will face the table and screen will be hanging from the table (similar way how they put chairs on tables in restaurants to clean floor). Put some cloths or paper between keyboard and table, make roll from paper and put it also between table and keyboard near table’s edge. This will lift laptop a little bit and allow adhesive remover to flow down to the paper/cloths. Put some remover under the batteries (I bought nail’s remover with acetone), wait a while and remove batteries. Clean the rest of remover from the bottom of laptop and you are ready to put new batteries. It is easy and can be done in 20-40 minutes.
I've just watched the video and... that was pure pleasure to watch repairer. She's professional and beautiful!