she is correct, its not that hard IF you have light fixtures where the fan will go. If you have light fixtures on the ceiling, then you have juction boxes and in todays homes, they will handle the weight of a ceiling fan.
What you need to make sure you do is to attach the fan blades to the motor as tight as you can. And try to tighten by hand each screw the same tightness. this will help in reducing wabbeling.
If you do not have light fixtures on the ceiling where the intended fans will go, then you need a licensed electrician to run wiring and set up a box and cut the hole in the ceiling. Since you will have him/her out anyway, have the fans already assembled and have him/her install them on the ceiling.