It took about an hour to install. The video they provide is helpful but there are some steps that look easier in the video than they are in real life. I purchased this for my dad who is 86 and still rides 15 miles a day. He wanted an electric bike but would not be able to lift a traditional electric bike onto a bike rack. The key feature of this is that you can install it on your existing bike. It’s also good that the battery is very lightweight. The downside is the range of the battery. Depending on how much assistance you need, you might only get 15 miles per charge. We ended up purchasing a second battery because we typically go on 25 mile bike rides. Having the back-up has been very useful. The other thing to be aware of is if you purchase the upgraded display unit, it’s not very easy to see what level you are at or how much battery is left while you are riding. We need to stop and cover the display with our hand to be able to see it. Otherwise, we are very happy with the kit and hope to get many years out of it.