With the proper tools, it is easier than expected. Thanks
The hard drive was defective and I wanted to add RAM
Easy repair because:
I look and read twice the guide and the day after I proceeded.
I ordered the parts and the tools (suction cups)
I was surprised how the screen came out easily.
I made sure to position the screws so I can put them back at the proper place.
The hardest part was to put back the power supply cable connector, there is no place for the fingers (step 10).
The hard drive bracket was challenging, the details in the step 12 are not sufficient.
If I had the time, and a camera, I would have take some more pictures.
The hard drive bracket is some kind of a hinge. So just take your time on this one so you can replace it with no broke tabs.