Hi @seasky I can really relate to what you've said. For context my DW and I (also a woman) are currently in stage 2.
Many years ago I read something about adoption, can't remember the specifics, bit it gave me the impression that adopting is literally like bringing a dragon into your home - I somehow felt that the child would be truly terrible to live with, would be certain to end up in prison, you get the picture.
Then a little while ago I met up with some friends who were fostering, and the children they were fostering were so lovely, I asked my friends and they were really happy, and I realised that my previous ideas were not accurate, and we (slowly) began to explore adoption.
At many times in the up until we began stage 2, I've been anxious about the difficult behaviour and stuff, so I completely understand where you're coming from. I was reading this forum obsessively and it was really worrying me.
The first thing that helped was reading Sally Donovan's Unofficial Guide to Adoptive Parenting, I think it's called. I have seen some people here say they don't like that book as it's so negative, but I actually found that book gave me hope, as it was the first time I realised that there are things you can do which actually do help manage the behaviours, but by dealing with the actual causes, like the low self esteem, feelings of shame, things like that.
The other thing was realising that the person who is behaving in this way will be someone that you love (not at first but in the long run). I don't know if that makes sense? I don't think I'd exactly realised that I've love the little person, and it will be my job to support them as they grow up, and part of that will be managing difficulties.
Please also remember that people will be more likely to post when things are hard, because that's when they need support and advice.
Please let me know if any of this isn't clear. And I hope I havent offended anyone with what I've said about my perceptions initially. I'm aware my perceptions are wrong, but just trying to be honest about what my fears were.