My singing teacher gave me a piece of wonderful advice.
Sometimes you're learning a song and the breath control is hard, because the phrases are long. Take, for example, the first line of Linden Lea, an English classic and grade 4 piece, I think:
"Within the woodlands, flow'ry gladed, by the oak tree's mossy moot"
Even if you're taking the whole song at a bracing gallop, it's a long one, and because it's right at the start of the song you're not quite in flow yet, but it spoils it if you breathe in the middle. When I started singing this I'd always be turning a bit purple by the end, and "mossy moot" would come out as a hissy, last-bit-of-air-escaping-tyre, squeak.
How to get this better? Practise the phrase, not as it stands, but with an extra sub-clause at the start, so sing, again and again:
"Within the wood, within the woodlands, flow'ry gladed, by the oak tree's mossy moot"
Your breath budget now has to last a few syllables longer, and you get used to spreading it right to the end (with perhaps still a tiny bit of hissy squeaking at the end). Then, sing the phrase again with the extras cut off the start, and wonder of wonders, you've got loads to spare, you cruise through it easily and triumphantly, so much that you're not even having to take in a massive gasp before starting "the shining grass blades, timber-shaded, now do quiver underfoot" (another long one).
As with singing, so with life. When I had a small baby, who rapidly became a toddler, I thought my life was full to bursting. Meeting his needs was consuming every scrap I had to offer, aside from what I spent on work. Then I had baby 2, and more than double the demands on my time (surprisingly, the existence of a smiling, disney-eyed snuggly mother-magnet doesn't make a three year old less clingy), and gosh, these six months have been hard. But when Bonzo goes off to playgroup some mornings, my time sighs and stretches into the space, I revel in the slowness of life with the baby, we potter and chatter and burble and tickle and it is easy, so easy.
That was step 1, the first extension to the phrase, and it was building up my strength and skills at handling two. Then, enter the scruffy dog, a beautiful shabby needy lurcher, and now there are three warm bodies that all want to be touching me, three potential danger sources all of whom could hurt any of the others (and themselves - so there are nine different hurting combinations available, before you count one of them hurting several at once). The chaos levels have stepped up further, and the carpets are hairier, but the big blessing turns out to be the way that it's just drawn my breath out for longer. Now, when H goes to work and takes the dog with him, "all" I have to deal with is two children and there are "only" two sets of needs (mine don't count). I feel foolish at how well this mind-trick is working on me, but at the same time it's wonderful. I don't feel more overwhelmed with three dependents; I feel more capable at all the times I only have two, or one.
Of course all this sends me back to my terror in pregnancy about whether I could possibly hold enough love for both of my boys, whether there was enough of me to go round. It turns out that there is, that actually the "me" has grown (no, "I have grown" doesn't say what I want it to), and that my mothering muscles are strengthening with each day of (tear-inducing, soul-breaking, exhausting) exercise.
Now all I need to do is work out what to use all that spare breath on...