Very handy and easy guide. No difficulties at all. The only problem i had was the replacement fan (bought on iFixit 2th hand). The screw openings where not exact as original (4mm of the left side bottom side of right fan), but i managed to first soft place the screws in and then all make them tighter. This was the only way it fits. Tested and approved. (you can even feel the broken fan as u hold it and turn it with your vacuum cleaner). Thanks to the author for his work. Happy client..