Tents in general don't have a great reputation for being easy to set up. You've got all the material, and the poles to fit into the right holes at the right time, then there's the guy lines and the pegs.
Thankfully, more and more beach tent manufacturers are really trying to find new ways of making life easier for parents. Plenty of beach tents are now relatively simple to assemble. Pop up baby beach tents are also increasingly common - they open up in a second or two, but can be a bit tricky to fold away.