So I did it today and it's not as difficult as I thought it will be.
It took me approximately 1 1/2 hour as I decided to proceed slowly and carefully.
Here are the steps, jusyt like in the video above.
1.Remove the Givi Box, the plate, and its bracket.
2. Remove the rear cover using a screw driver

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3. remove the handrails bolts using 12mm wrench
4. Remove all the bolts and screw holding the storage box (10mm bolts)

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5. In my case I didn't even remove the storage box entirely, just lift it a little bit and then you will have enough space to remove the nuts on the top of the shocks.

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6. Remove nuts (14mm) on top of both shocks, as well as the bolts (12mm) holding the suspensions below. (no need to remove air filter box in 2014-2017 model)
7. Install both the new YSS shocks. Should be easy.
8. You need to remove the bolts (14mm) holding the muffler as it's not possible to re-insert the rear shock bottom bolt of the YSS shock. No trouble reinstalling on the left side though.

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9. Once all bolts and nuts of the shocks are tightened, you can now slowly reassemble the scoot in the reverse order.
Tighten muffler > reinstall storage box > handrails > back cover > givi bracket and plate > givi box
Notes:
Rear shock top nuts torque (25 NM)
Rear shock bottom bolts (16NM)
Muffler bolts torque (30NM)
Tools
Wrenches (10mm,12mm,14,mm)
Screw Driver
Hex Key
Torque wrench

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Done! and I'm glad I didn't mess up

Everything looks better from the inside of a motorcycle helmet...