I'm an older (74) guy, but I was able to install the 3-piece ramp by myself. However, here's an issue: My curb curves slightly, and I was unable to get the ramp to curve as much. I didn't put the nuts on the bolts as far as suggested in order to make sure the ramp would curve more. It still didn't quite, but it curved enough to satisfy me. I suggest measuring curb curvature like you suggest for curb height. With a tape going straight from the top of the curb to the top 12' away, measure the distance from the 6' mark on the tape to the top of the curb there. Mine was 6 inches. Here's is where a second person might have helped to stretch the rubber pieces to the extent the bolts would allow, but I didn't have access to that person.