I use PT4 to analyze hands after every session. I have mutliple custom tags that I use to tag any hand that I am unsure about. Some of the tags I use indicate which street has the most difficult decision, that the line I took was not optimal, or to use NASH ICM Calculator. It is a great way to go over your play because most hands are fairly straightforward so pinpointing the difficult or interesting ones is a time saver. After a session, I can have anywhere from 10 to 100 tagged hands. I go over all of them and type my thoughts and reads in the hand note. If I am faced with an all-in or river bet, I often range the villain and enter that range into the equity calculator to see if I am getting a good enough price to call. This process usually narrows down the list to a few hands that I need more help analyzing from poker buddies. I save them with a special taag indicating that they need more analysis and go back and forth analyzing hands with friends sometime each week.

Yeah I use those options only I created a few of my own because the default ones were too basic. You don't need to open the HH replayer to tag a hand, you should be able to do it from a drop down option in the PT4 menu for the table. It has the current hand and the previous 5 to choose from. Yeah, then you can filter PT4 to only show marked hands either in today's hands or in a HH report. It's a bit confusing at first, but not too bad after some experimenting.