I haven't read the whole thread - just the OP - but wanted to add my two cents (really long, sorry)
My daughter is now just over a year old, and before she was born, I had exactly the same worries as you. When it came to it, my daughter was born very prematurely and spent her first few months in hospital. Once she was home, she was hooked up to 24/hour supplemental oxygen from a canister (and still is, although hopefully not for much longer). So the absolute last thought on my mind was taking care of myself.
BUT.
After her first day at home, which I spent constantly checking her oxygen supply, not showering, not eating, and doing all the 'Mum routine' things I'd heard about, I realised that part of the reason I was doing, or not doing, those things, was because it was what I thought Mums inevitably did. Everyone had said not to put myself under any pressure to get the house clean, to shower, to make myself look decent, or to do anything other than bond with my baby. I followed that advice, and I felt like hell. I felt like I wasn't coping at all. I did feel very bonded to my baby. But I didn't feel like me at all.
So the next day, after about two hours sleep in 5-minute bursts, I put my baby, and her oxygen cylinder, within view of the open bathroom door, and had a shower. And wow, I instantly felt more capable. Then I fed her, settled her into a (five minute) nap, and sat right next to her putting on my make-up. Another little boost that made me feel like me, and like I could cope.
I've continued to do exactly the same ever since. Sometimes I manage to get up and have a shower before she wakes up, sometimes I can get her playing with a toy for long enough for me to shower, and sometimes I have to wait until nap time.
I have had a few other mothers comment on the fact that I have brushed hair and make-up, and say rather sniffily that they are too busy spending that time with their children to be 'bothered'. Hmm. Well, in my case, I am ALWAYS with my daughter when I am doing my hair and make-up. She loves to sit next to me, holding the make-up brushes, bashing the lipsticks together, and giggling at me pulling faces at her in the mirror. It is not time taken away from her, it is time spent together.
So after all that (longer than I intended - sorry!), as someone who has just finished the first year, I would say that my advice so far is to make everything you want to do a shared activity. As soon as you can make it fun for her, it's not an 'extra' job to get in the way, but something else fun to do together. Same applies to mealtimes. I admit I did eat one-handed for a few months, and played pass-the-baby with DH, but very soon we were able to finish meals by simply including her in the activity.
We'll see how it pans out as she gets older. I have the toddler years to contend with now, so who knows what that will bring...