I managed a wee bit of painting yesterday, and I'm actually mid-game (well, early-game) against my kids' combined arms force of Necrons and Space Marines. I'm trying to get the hang of objectives, but so far we're at the top of turn 2 and I've already forgotten to attempt to set a teleport beacon

But at least I've remembered that I forgot. So far I have learned:
- cover is good, and easy to get benefit from.
- It's very easy to forget things, as rules for any given interaction are spread all over different pieces of paper*
- being charged by 10 flayed ones is not good for kabalites, at least not for any kabalite who doesnt want to be turned into pate.
- While shooting your ravager's 3 darklances at a Repulsor Executioner is gratifying, it is not advised, as it just pisses him off, and the ravager Does Not Like the clapback

I was also kinda surprised to realise that I can barely field 2000pts of dark eldar, at least painted ones. Those lads and lasses are cheap these days.
*I mean, really, does it need to be so complicated? F'r example, a unit of Incubi charge something. Disregarding any shenanigans your opponent might have to hand, you still need to refer to (and remember the relevance of):
Incubi datacard (for base stats)
Archon datacard (s/he gives them re-rolls on wounds)
Archon Enhancement (means they can't be overwatched)
Army Rules for Pain token usage and effect (this gives them extra AP, rerolls to hit, and affects the archon's rule)
Detachment rules (means they get Lance on the charge if they disembarked this turn)
Stratagem usage (so they can disembark and charge)
I suppose, on the plus side, at least all those rules aren't published in different books that each cost upwards of ichi man en, so we should at least be grateful for that, but I can't help but feel there has to be a better way to present rules interactions than "just remember them all". To be fair, those incubi are something of an extreme case, but they're not
that extreme. Basically, any time you want to do anything, you really need to be double checking if something else affects what you're about to do. I'm doing my best, but my kids are utterly lost. Sean is remembering to score objectives and regen his necrons, but neither of them has even looked at their stratagems (and while I'd happily point this out, they're already kinda struggling to keep up, so what's happening is that on top of remembering my own rules interactions, I'm trying to remember
theirs, too, so I can specifically point out when they might want to burn a CP on something. The cognitive overload is huge, and frankly exhausting.)
But, lest this end on a grumpy tone, I have to say that my kids (and I) are enjoying our game. I kinda see learning the rules as a bit of a mountain to climb, but I guess I'm making progress. Hopefully by May I'll have enough of a handle on things to feel comfortable playing
