We are very happy with this vanity. My son helped me install it. The delivery guys did not want to lift it up the stairs to our front door (12 steps), I don't blame them though, it is very heavy- and all one piece. We disassembled the box leaving cardboard on the sides and strapped it to a hand-truck to get it up the steps.
I had to cut holes in the shelves to allow the P-traps to fit. I expected some of this after watching some videos (shout out to the StudPack YouTube channel).
We used a hand-truck dolly to get it up the steps then a floor dolly to get to the bathroom door. You will likely need to remove your bathroom door (heads up on that).