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Thankfully most of the models you can buy arrive pretty much fully assembled. There could be the odd little bit that requires attaching but it shouldn't be a major of frustrating job. This is great as your children will be wanting to try out there new toy.
So now to some more practical considerations. As will everything battery powered they will need recharging. With a new battery you should pretty much obtain about 2 hours of driving time. As the battery is recharged as time passes the energy of the battery will reduce so it won't last for as long after being charged.
Although they are toy card for kids they can be quite heavy so if you are setting up a longer trip probably to the shops or regional park then make certain the battery is fully charged beforehand. You do not want to be far from home when the electric battery runs down since it means you will definitely need to push it back.