I thought I ordered assembly for this thing - and I didn't. I assembled this thing myself and it was an effort let me tell you...BUT not impossible. I was able to do it by myself over the span of a few hours and with the aid of some chairs and stacks of books. The bed I LOVE. Very sturdy. It looks awesome and is so roomy and cozy. I bought the 8" firm cool gel memory foam mattress in the XL for the top and the  8" memory foam for the bottom and it is SO comfortable!! It is tall - when my tall friends come over it's funny to see their feet not touch the ground. I've slept on both. The only thing I wasn't expecting or didn't know about trundles is that it is a free floating little bed that can go anywhere which is kind of nice.