ZZsounds Digital piano question 10 points best answer?

I need to know how heavy a digital piano is i know its usually around 100 pounds but is that easy to move with 2 people i dont know exactly how heavy 90 pounds is and will the delivering people just leave it on the outside of my apartment building if i order from zzsounds because if it is really heavy there are 3 steps on the outside of my building so then wouldnt it be a hle for them to have to carry it up and back down if i am not there. another thing to get to my apartment i have to go up 2 fights of stairs will that be difficult with the digital piano if i have another person help me the piano i am buying is the casio ap200