Haven't BTDT but just wanted to say WOW and congratulations and, well, at least you know what to expect... but WOW. WOW. How far along are you? Do you have family/friends nearby who can help?
I do think that a lot of the difficulty of twins is the learning curve part -- I would like to think if I found myself in the same situation, at least I would have the confidence that I have been through it before... birthing two, nursing two, etc. Kind of like how the actual baby part (baths and nursing and dipes and colds and runny noses) of having a second baby is SO much easier than the baby part of your first.
Big hugs to you mama. If you live anywhere near southern Alberta, let me know and I'd love to help however I could. (oh -- just saw your post and see you live NOWHERE near southern Alberta... I will send good vibes your way!)