Think of 3 words that decribe you positively
ie
Relyable, dependable, trustworthy etc etc
think of best achievements - something you have done well & are proud of (dosent have to be work)
Harder now - think of opposites what are your weak points, what could you have done better.
Think of how you might improve yourself
ie would like to go on a course to improve ..........
What position is it?