I was made redundant from a good job (financially, awful psychologically) in industry.
I loved the PGCE - found it quite demanding but really fun. NQT year was harder in terms of stress. Since I started teaching, things have got worse in the UK - pressure is higher and support lower. I had children, and found FT teaching to mean that I wasn't performing very well as a mother - I had a lot less time with the kids than DH (industry professional). DH became a SAHD, which made it easier on the family, but my relationship with the kids was suffering.
Teaching in UK secondaries is really draining, and sometimes quite dangerous. I have some experience of primary, and find it a lot more draining but more rewarding too.
I came to the conclusion that I could no longer prioritise work over my family, so realised I had to make a choice.
We emigrated - I now work in an international school, and the change is unbelievable. DH is still a SAHD but the school community is such that he knows all the staff and their families, and is really enjoying the community feeling. DD is at school with me (is 3-18 school), so I won't miss her plays etc. If she gets upset (hasn't yet) I can just nip down between classes to her classroom.
The school is better resourced and far more laid back. There are no league tables, no OFSTED, no unnecessary observations, no unnecessary paperwork. My job is now truly family friendly, my colleagues aren't stressed and everyone enjoys their job. Now I love teaching, but it has taken a total change in atmosphere to achieve that.
If the UK could shoot Gove and his followers, recognise the excellent job done in schools and offer support rather than criticism, take away the hours and hours of endless bullshit and 'initiatives', I would say go for it.
Rather than getting some experience observing lessons, I would suggest you properly shadow a friend you know teaching for a week. Make a not of what they do with their time, before and after school as well as in the classroom. Teaching is incredibly stressful int he UK and can be disastrous for your health, especially your mental wellbeing.
Think long and hard before leaving a good job for drudgery, lack of respect and frustration. It can be brilliantly rewarding, but on balance, life in the private sector (in school or in industry) is massively less stressful. I say this after (many years ago now) leaving a job where I had to work very long days, weekends, travel and was hideously bullied by my boss).