In general a repair like this isn't easy for someone considers themselves a "novice". If you consider yourself this, you should consult your user manual or call your local mechanic.
Try turning your steering wheel a little before you turn the key over, it may be stuck because of an extreme angle on wheel when the car was turned off.
You will know if your ignition is locked if the steering wheel will not move in any direction. Also, you cannot start the car unless the wheel is freed.