what you want to be doing is looking at the decision from the point of view when you played it. you should be going street by street, thinking about the possible choices you can make, what your opponents ranges might be, what stack sizes there are and how they relate to each other, what stage of the tournament you are in.
you should be reviewing spots in tournaments that you get confused about. when i'm in game, i have a notebook open, and if any spot arises that caused me to think hard about, i mark the hand, or quickly mark the spot on notepad. it could be "unsure about what range to 3bet vs a 15bb stack who raised on the button". then i'll go into my tracker and use filters to try and search for similar spots i've been involved in so i can review many hands of similar situation.
i remember you play 180 mans from a post you had a while ago,
so a spot you might want to review is when you are in the Small blind in an unopened pot when you have around 0-12 bb's and find out how much you are stealing. use filters in tracker to find many spots the same, and then review many hands in a row of a simialr spot, trying to work out what differant ranges differant villians might call with.
early on in postflop spots, it becomes much trickier. you really need to be a good player to be able to recognize if your play is good or bad. however the only way to get to be a good player is to learn. books, forums, coahing, whatever it is, that will give you a great base knowledge for you to be able to review your own hands.
also, posting hands in the HA section will give you some really good feedback. just make sure to include every ounce of information you can. stack sizes, ranges, if players are tight/loose, hud stats. anything and everything will yield you much better responses in the HA (hand analysis) section.
hope this helps, but it is a really tough question to answer!