Brainstorm solving your own problems in front of them.
Exactly this, be open about your own challenges, failures, successes, etc. Discuss current issues in front of them. OH and I have actually "staged" discussions in front of our son so that he can feel part of the problem solving process (even when we've already discussed it and made decisions when he wasn't there). But then, we've always been open with him, right from an early age and not sheltered him at all. When he's faced difficulties, we've never let him simply walk away and give up - initially we told him his alternatives, but as he's grown up, we've helped him work out his own strategies. From being a "needy" emotional child, he's now on the cusp of being a resilient/responsible adult! We've frankly been amazed at how he has shrugged off some bad experiences and "just got on with it".
One thing that we've really encouraged him to be part of is DIY, housework and gardening etc, so nothing whatsoever to do with school and academia, so no "formal qualifications" required and something that anyone can do! When we've re-decorated a room, we've had him help us, so that he can see all the various stages we go through, i.e. the organisation/planning of emptying the room, the stripping to see the room at it's worst state, then the preparation of sanding/filling/undercoat, etc., to start the process of restoration, the planning of each stage (i.e. you can't sand when you've just painted), then to the wallpapering and final top paint coat, and finally to putting the furniture and "stuff" back in and to see the finished result. Being part of that highlights the importance of planning, how things get worse before they can get better, juggling different tasks in the right order, and finally the end result. It's also allowed him to see us deal with unforeseen serious problems by calm, logical thought, rather than throwing things about, shouting, arguing, etc.
Same with gardening. Every year, he sees the planning & preparation that goes in. Simple things like planting seeds in the trays at the right time, thinning out and re-potting at the right time, planting in the garden, etc. We really try to hammer home that good things take a lot of time, planning, preparation and organisation to happen. And to show that it's far more enjoyable to see a plant grown from a seed rather than just nip to the garden centre and buy a ready-grown one! Not to mention that a plant grown from seed costs a few pence rather than the few pounds a fully grown one costs, so you can grow a border full of plants for the price of a couple from a shop!
It's that kind of thing long term planning/organisation skills which we can then transfer over to his education, i.e. to show the value of keeping up to date with school work and a "little and often" approach to revision, rather than rely on last minute stressful cramming.