We have the QuechuaXXL llll and I can pitch it and pack it away easily on my own. It took some practices but once you have the knack it's quite simple. I think the hardest part is packing it away, knowing what to fold down when. Mine is smaller than yours though. But once you have done it a few times it should be ok. The instructions are on the bag and are well laid out and clear
Yes, we have the Quechua 4.2 and its fine, if its really windy then its a nightmare as you do need 2 people. DH was busy helping someone else and I took ours down and shoved it in the bag, someone did help me put it into the bag though. Nice lady in the tent next door.
I can also pitch the 4.2 seconds base alone. The folding is fine once yhave the knack, the staff in decathlon actually describe it as the cock and balls as soon as you have a cock and ball shape it just flips into place.
I can put it up and down on my own, just takes a bit of practice. The video on the website is very helpful. We love ours and its great for weekends and trips with small kids as you aren't spending hours putting it up/down.