For whatever reason I've fallen into playing baby NL games of late, usually $100 NL. It's been interesting, especially coming from a background as strictly a LHE monkey for quite awhile.
Poker is obviously poker, so I can't claim any grand epiphanies, but it is interesting experiencing some of the things you've seen bandied about by others, as far as the major differences between the games, and common advice given to limit players who are taking up NL. I repeat, none of this is rocket science, and old, old news to you NL superstars out there. This is more a reminder to myself, than anything.
1) Don't go broke with TPTK : You learn to push TPTK pretty hard in limit, and rightfully so. For every one time it goes down in flames and you lose a big pot, you'll win two pots.
NL, though, is a different story. Consistently shoving your stack in with TPTK will more than likely result in you going broke, over time. Most of your real money comes from sets taking down TPTK/overpairs, not from bludgeoning opponents into submission with just TPTK.
I'm still struggling with this one, especially at some of the crazy Party NL tables. If you're playing with opponents that will merrily shove into you with KJo on a K 10 4 flop (after calling a $4 raise from you pre-flop), AK looks pretty damn good, and it's next to impossible for me not to call. That same monkey can just as easily have K10, though, and be reaching for your stack. As much as I tell myself to wait for a better spot and to not get caught up in the push-monkey game, I still am tempted too often to call in that spot.
2) Sets are where you make money: The logical application of this is to be much more willing to call with any pocket pair, from pretty much any position, even if/especially if it's raised. I have to work to get myself out of LHE autopilot mode, as far as automatically mucking 22 if there's a raise in front of me. Obviously you have to temper this if someone later to act is persistently coming over the top, but baby pairs are a lot more valuable in NL, and you can't be mucking them consistently just because someone has shown strength.
Where I'm still flailing around here is how to play the baby pairs when I'm opening the action, as far as whether to try to limp or to go ahead and bump it up 3-4BB. Being aggressive is almost always better than not being aggressive, but a lot of the value in 22 is in flopping a set, as it's hard to continue otherwise, even when showing strength pre-flop. I tend to open-raise with baby pairs but I feel lost when a couple of people call, the flop comes all overcards to my baby pair and someone leads into me.
3) Don't be afraid to lump it all in on the flop with a really big draw: This one is pretty self-explanatory, but a bit different from LHE. While you'll often pump your big draws on the flop in LHE, the psychology is a bit different, as you've got assorted escape hatches if you blank on later streets.
In NL you might currently be behind on the flop, but have a big enough draw to not mind getting it all in. The dilemma is that you want to see the river, and not be faced with a difficult call on the turn if it blanks. So the relatively simple solution is to not be scared to lump it all in on the flop, with your monster draws, and hopefully pick up some fold equity while removing the temptation to abort the mission on the turn if it blanks.
4) Junk is pretty much junk in LHE, but junk can be valuable in NL: This one is completely self-explanatory, but deserves a token plug. If you're on the button in a LHE game and there are three limpers ahead of you, 68h is a junky hand that you fold 100% of the time, even if you know the blinds will just call.
Give that same hand to a skilled player in that exact situation in a NL game and they can probably extract a decent profit from it, over the long run. It's still pretty much junk but the ability to take someone's entire stack in one fell swoop puts a bit of a shine on otherwise junky hands.
This one is still hard for me, not so much when I can limp in behind a few others but when there's a raise after me, and only a few callers. I realize I need to limp/fold in most of those cases but I get a little greedy at times and call the raise too often.