All teachers I spoke with recommended me not to get into the profession. At the end I was invited to observe a school day, and I liked it so much that at the end of that day those same teachers told me to go for it!
I would say from my short experience that teaching is indeed tough. The PGCE is tough. I expect the first years to be very tough. Compared to my previous office job, this is much harder. But when a lesson goes well, and when I start feeling that I'm building relationships with my students, it all gets greatly compensated and I remember why I made the change.
If you want to do it, do it. My advice would be not to take it as a full lifetime commitment: If you like it you stay, if you realise you dislike it, well, you quit, nobody's going to force you to do otherwise. But if you don't try, you won't know, and you would be thinking about it for the rest of your life, perhaps regretting no having made the move.