Very easy to install. I had never installed drawer slides before but needed a floor mount style which I could only find online so I ordered 4 of these. I make vanity drawers that used to be just shelves with baskets. They needed a bottom mounting rail because the side of the drawers closest to the vanity unit couldn't be attached to this wall unit (it's curved), so side drawers weren't an option. I found these slides very easy to set up. All I really needed was a picture on a guide. Reading the written instructions was a little confusing but the picture is great. Assembly involves accurately measuring and marking the bottom of the drawer in the center and placing it on the back wall and in the area of the shelf where the drawer will stand. You spread the rail and use the two screws provided to attach the rail (the one with no bearings or backing) to the bottom of the center drawer. Then, using 3 screws, attach the back panel to the wall with 2 screws, insert the piece with bearings and attach it to the shelf with the remaining screw. Next, insert the plastic guides into the area of the shelf where the front corners of your drawer will be. The picture really makes everything clearer.