I mostly review hands by mass-importing SnG hands into ICMizer. Which per definition mean, I am not studying my own postflop spots all that much. I try to make up for this by contributing to the hand review sections, where I then get to look at other peoples postflop spots, and by watching free training videos on Youtube.
For instance I have watched a series of videos, that Jonathan Little put out, where he go through a bunch of hands, he played in $1/$3 live cash games. If I pretty much agree with all the decisions, a good player like him made in postflop situations, and understand his rationale as well, then I am confident, my postflop game is not completely terrible.
Looking at your own hands without using software like ICMizer or a solver can be fine, but its mostly usefull for identifying spots, where you were playing your C- or D-game. Like maybe when you see a hand again, you think "OMG why did I make that river call", or "that was a terrible bluff". But this only allow you to identify situations, where maybe you were tilted or to tired or whatever.
If for instance you bet the river in a situation, where you should clearly have checked, but you did so without being tilted or tired, then when you see the hand again, you will still think, this was a fine play. So you need to check your lines against either software or other good poker players (like a coach) to actually learn something, you dont know already.
If you dont do this, then reviewing sessions is mostly a tool to find peace with losing sessions. Like if you are a cash game player and had a bad session, where you lost 475BB, then you can go through all your big losing hands and convince yourself, that you just ran bad and did not make any major mistakes. But this does not mean, you actually learned anything, that will help you in future sessions.
