Firstly I want to say that this is a great TV stand and is made from materials that look high quality.
The stand comes as two boxes. (One for the wood ends and the other with the metal work and glass shelves). The first thing you should do is check that the glass shelves have not been scratched. One of mine were, but the Amazon marketplace seller I bought it from rapidly sorted that out with a replacement. I didn't even need to return the damaged glass!
Assembly is straightforward but definitely made easier if you have two people. Attach the metalwork to the wood with the supplied screws. Stick pads on the metal frame and then lay the glass on top of the pads. For the middle shelf you have a choice of two heights. The more middle of the two options should allow all but the largest amplifiers to fit nicely on the bottom shelf.