We bought the VIGO shower door for a bathroom that we rebuilt from scratch.  Just my wife and I.  We know no fear.  But we were installing the LARGEST version of this product (72X74), and that took us to our limits.  These are very large glass panels, so the sheer weight (over 100 lbs) was a challenge when handling them.  Also, I strongly recommend that you read all the way through the instructions a couple of times, and make sure you understand each step, before beginning.  There are some sections of the instructions that aren't crystal clear; but if you understand and follow them, you'll be OK.  Now that the door is installed, we love how it looks.