This rack is very easy to assemble. (If you have a good electric screwdriver, or drill with screwdriver bits.) You should be quite aware that it is cheap, unfinished wood, and it will NOT be a piece of furniture that you'll want to display to you wine buddies. Mine is under the stairs in my basement. It's easy to get to the wine, and pretty much out of the way.
There is one important point you should be aware of. The spaces for each bottle of wine are designed for you typical 750ml bottle, and are separated from the other bottles by small wooden spacers. They are not in what you'd consider separate compartments. I placed a bottle that was somewhat wider than normal in the rack, and when I removed it, it dragged the bottle underneath it out as well, which smashed on the floor.
If you use this rack with any odd shaped bottles, be very careful inserting them, and removing them. This rack will definitely not hold 1.5 liter bottles, or any of my Chamoagne bottles.