Just finished getting this beautiful gazebo put together. I love it. For the roof panels I figured out a small trick that really helps. First make sure you have 3 people. Also use the cardboard strip that comes in the long box and c clamp it to the roof bars. It acts like a guide to hold the panels up when you slide them in. Always slide first on the straight side. Have someone up top to help pull the panel in place and keep the straight edge in the guides. Once panel is in place work your way down on the slanted side to make sure the panel is all in the guide. Took a while but it sure is worth it.