Re: 7.5 mo difficult to nurse to sleep :(
This isn't your "fault" because you didn't sleep-train your child! There's absolutely no reason to think that sleep-training would result in a baby who always fells asleep easily. Most people who "train" their babies with cry-it-out methods have to do so multiple times, because night-waking is normal and because it often re-occurs when baby is sick, or teething, or mastering new developmental milestones.
What's your bedtime routine like, at this point?
Coolest thing my big girl said recently: "How can you tell the world is moving when you are standing on it?"
Coolest thing my little girl sang recently: "I love dat one-two pupples!"