Assembly took my mechanical inclined husband a full day to put together. But he was able to do it himself, with just me holding a few pieces. Definitely need a good electric drill or it will take forever. Some boards were a bit warped and he did need to saw a bit off one. On the tower. But overall very happy with our purchase. My daughter is 3.5 and I see this being perfect for us till she’s about 6ish.