That depends on how the competitor acted on previous hands, when analyzing a person you need to have a threshold of their behavior (just an example): if person A blinks a couple of times looking at his chips before setting his bet, and wins with a very strong hand, you have an indication that the blinking is his 'give away'. But it doesn't have to be blinking, could be a specific muscle in his neck, hand movement, checking cards etc. Look for a threshold, and you're good to go :) ( I gained this information by reading 'What every body is saying: An Ex-FBI agent's guide to speed-reading people' by Joe Navarro. Practised a lot with it myself on how to detect these thresholds. Awesome book btw, highly recommend it, tons of great info).
Well, to each their own of course. Strategies differ per person :P But when I am playing poker myself, I try to utilize mathematics and body language.
Gratz on your winnings! That is awesome ^.^ I'm more of a roulette player myself, gained 2x300 euro's last week in 2 visits, while being 30 minutes in the casino itself. :)