20 - 40 minutos
Wine. Wine was the problem. A glass of wine all over the trackpad. Munted it completely, cursor was randomly zipping everywhere opening apps and windows.
Replacing the Trackpad was easy-peasy lemon squeezy. All works fine now.
I think the guide says it's moderately difficult but I found it easy.
Just print out the guide and follow it. Use an ice-cube tray to store the screws