Yes, get the training so whatever mnemonic you use makes sense, and you learn appropriate response to what the assessment reveals, etcetera.

I was looking around and found several assessment mnemonics but this ABCDEFGHI seemed the most complete and matched a couple Trauma Nurse Core Curriculum postings [fairly big download]:

http://www.schoolhealthservicesny.com/uploads/SN%20Emergency%20Care%20Course-Instructor%20Manual.pdf

See pages 78-79.

Airway
Breathing
Circulation
Disability
Expose/Examine
Farenheit
Get vital signs
Head-to-toe assessment
Isolate