This whole post was me - get to the turn, think "wtf?!?! now what did he do preflop...oh, screw the whole range thing, I'm all-in." I'm a lot better putting villain's on ranges during the hands, but I got better by watching a TON of hands in the HEM replayer, with hole cards hidden and HUD stats showing, stopping the action on each street. I chose big pots that went to show down (so there would be lots of action to narrow ranges) that I wasn't involved in so I didn't remember the outcome (like I would have if it was my stack won/lost).

After only a couple of hours of work, I was getting pretty good at it. One thing that helped was a chart I made listing each hand in terms of its hot/cold (all-in) strength a la Poker Stove, and then reworking it into coherent ranges for various VP$P/PFR combinations. When I went back online to the tables, I pretty quickly got "up to game speed" with my reads.

Here is an example of the range work I put together using Poker Stove:

4% PFR: 99+,AK, AQs
10% PFR: 77+, AJ+, KJ+, ATs
16% PFR: 22+, AT+, KT+, QJ, A8s+

These are basic ranges that I tweak based on reads - they don't include much consideration of suitedness or the fact that many TAGG's open 22-77 before KJ, but they get me "in the ballpark."

I'm leaving a lot of the results unreported (I have all even PFR's <35, for example, with notes about how they change when a person overplays Axs or suited BW's, etc), because I think you remember it long term BECAUSE you did all the work figuring it out in the first place.

BTW, I did the work because I was break-even for like 50k hands at 10nl, which means I REALLY sucked at poker for several months. And guys like Jyms, Spoon and BJaust kicked me in the ass for being a lazy sonuvabitch, and spewing when I should be pwning the micros. Trust me, when Spenda or Spoon or rilla start suggesting a "thinking" project , it will help your game if you do what they say. I had a $300 br 3 months ago that's now 10x thanks to those guys' "encouragement."

So, while I'm not perfect at putting opp's on ranges, yet, the 10 hours or so effort was +++++EV for me, and could be for all y'all.