I guess the best thing one could do is to prepare as much as possible. The fact that you're self-reflective and rational enough to already know that attachment-styles could be a potential issue, is encouraging. You're on the right track.

I don't have kids of my own but have many surrogates (I'm a teacher). In the end, and as cliché as it might be, a lot can be accomplished with love, discipline, boundaries and consistency. I'd encourage you to not just look at the possible problems (like attachment styles) but to look at possible tools, like how children learn (positive and negative reinforcement). What environment will be the most conducive.

In the end you are the parent, and you know better. Never forget that. Also, it's probably going to be 50% preparation and 50% "winging it". Sorry for randomly popping in on your comment. Just wanted to wish you good luck!