First Aid Means that- You can save a Life. Even phoning 999 or 112 can make a huge difference. There are other things you can do.
https://www.youtube.com/watch?v=AGznNGtT4xw
If you are unhappy about performing CPR- You can greatly help the casualty by placing them in the recovery position which opens their airway and keeps it open while placing them an a safe stable position which keeps the airway open.
https://www.youtube.com/watch?v=uCDa-AhrjHo