Hoping for a career change into teaching
I changed from PFI contract bidding as an engineer into teaching 6 years ago. The good thing about a previous career is that you jump ahead quite quickly if you want to due to management experience (people or project), but it's a fucking full on job. I work far, far harder than I ever did in my old job, for half the money. I think about teaching the whole time, even on holiday I'm buying things for the classroom, or for a topic. The political and societal interference is really galling - you feel as if you've trained to do this, you know for sure that you understand your class, know your kids, yet you are undermined by everyone in society - often very vocally, and to your face as if you'd like their input. The kids are great, the curriculum is not, the term time hours are great, the fact that you genuinely don't get your holidays (despite what non-teachers seem to think), are not. I work at least half of them, often in school - I had more real holiday in my old career. The fact that your job is a global opportunity is great, the fact that you are NEVER away from kids, is not.
Before you change, spend some time in schools - no, spend LOADS of time in schools. Not your kids school either. Talk to teachers who are NQTs for their enthusiasm, then talk to teachers who are 5+ years into it, and getting a little jaded... get real opinions, and don't dismiss their opinions as 'yeah but everyone complains about their job'. It's a vocation, it takes over your life.
Despite absolutely loving the actual classroom stuff, the rest is all encompassing, and as soon as any kids we have are at secondary school, I'm out of education.