Short Answer 
To assist a person in need, first ensure the scene is safe before approaching. Check the individual’s responsiveness and breathing; if unresponsive and not breathing, assess for a pulse and begin chest compressions if necessary, avoiding rescue breaths unless trained.
Step 1: Ensure Scene Safety
Before taking any action, make sure that the environment around you is safe for both yourself and the individual in need. This means looking for potential hazards such as traffic, fire, or unstable structures. If the scene is not safe, do not approach the victim until it is secure.
Step 2: Check for Responsiveness and Breathing
Approach the person and gently tap them while shouting to check their responsiveness. If they do not respond, it is vital to examine their breathing. Look, listen, and feel for any signs of normal breathing. If there is no breathing or only gasping is heard, prepare to start CPR.
Step 3: Assess for Pulse and Begin Compressions
If you are trained, check for a pulse to see if the heart is beating. If there is no pulse or if the individual is unresponsive and not breathing, start chest compressions immediately. Remember, avoid giving rescue breaths unless specifically trained, to ensure the person receives timely help.