The construction of the trampoline isn't entirely easy. But, honestly, we're talking about something that needs to be both very sturdy and well balanced. Of course the parts are going to be difficult to fasten together. (Also, pay close attention to the orientation of the pieces as you assemble them. They can go together a number of ways until you get further along and then realize one or two of them are backwards.) Not until all of them are in place are they going to counter-balance each other properly. So each step of construction until the last step involves pieces that are trying as hard as they can to separate from one another. :) We also received one with orange foam instead of the pink that's pictured on the site.
Like I said earlier, as a parent I wasn't entirely sure about this one. But my kids have convinced me that it's safe and fun. And the fact that it's such a simple item means that the kids are naturally more creative with it, which I always endorse. (Kind of like how a large cardboard box is a better toy than an electronic game... because imagination is required to expand its playability.) For the price, I don't think we've ever bought a toy more enjoyed by the kids.