Putting together the Step2 Unicorn Up & Down Roller Coaster is generally considered pretty easy. The manufacturer mentions that it's designed for quick assembly, with pieces that snap together, so you don't have to be super handy to get it set up. Plus, you don't need much more than what they include in the package.
From what we've found, a lot of parents say they got the whole thing assembled in under an hour, which is fast compared to putting together other kids' toys. The instructions seem to be clear, and help keep things straightforward. The parts are made to fit together naturally, and the guide does a good job of illustrating the important steps.
The whole setup, with the Unicorn coaster car and the 9-foot track, isn't too heavy, so it should be manageable during assembly. The materials are durable, which is nice to know when you're putting it together because you want something that can handle a lot of playtime with little ones.
It's probably a good idea to put it together in the spot where you're planning to use it. Moving the whole track once it's assembled can be a bit of a hassle. And, of course, make sure everything is securely clicked into place, because safety first as always!
Overall, it seems like the assembly process should be hassle-free and get you and your kids playing sooner rather than later. Once it's up, the design features like raised track sides and easy-grip handles should make for a fun and safe playtime experience.