An easy way to find if the coils are your problem is to replace them with some out of a mates car (make sure same model car and engine).
A harder way is to individually take 1 coil out, wrap it in electrical tape, put it back in and take the car for a drive. Keep doing it until the car is driving perfect again and then you'll know exactly which coil(s) are faulty.
If you know how to change your sparkplugs you know how to change the coils. All you have to do is take the center cover off, disconnect the wiring loom from each coil, remove the 2 bolts holding each coil in and swap it with the new coil.
It's about a 20-30min job in total to do everything.