I have a 3 month old and a 22 month old, so similar gap. DS1 was an easy baby, DS2 was a nightmare but is now settling! It's been pretty hard going at first, I won't lie, more mentally than anything as they both pull relentlessly in different directions (mainly by screaming until they get what they want), and I was sooooooooo paranoid about neglecting one by giving the other too much attention it was a 10 week juggling act. But at 3 months I feel it really is settling down. And the baby has started to watch the older one for entertainment.
We do get out and about a lot (it keeps you and the older one sane), so the thing I let 'go' is my own hair/make-up/clothes. I look pretty rough most days, but who cares really. I was also more committed to pelvic floor exercises/stomach muscle exercises this time, and my stomach looks pretty flat in the morning already.
Top tips are:
Sling - Close Baby one is fab and we have a Baby Bjorn for variety. Then you can cuddle baby and have both hands free for toddler.
Couple of bouncy chairs at different points in the house to put the baby down quickly if needed.
Retro DVDs that relax the older one while you breastfeed - we have Mr Benn, Bagpuss and Ivor the Engine - I kid you not, they are like valium for toddlers, and so much more bearable for me to be in front of than modern TV (I'm a 30-year-old fogey, I know).
Bathtime and bedtime at 6-7pm for baby as well as toddler, though baby is downstairs - then suddenly you've established night/day/sleep routine without even trying and have evenings to recover!
When it all gets too much - dump both in pram and head to nearest park.
Carry snacks at all times to keep toddler occupied while you load baby in and out of pram/bf in the car etc while out and about.
Baby is still wearing babygros all day and will continue to do so until 9 months at least!
I don't change baby's nappy at night unless he poos, I put him in one size up at night and that does the trick = more sleep for me and he doesn't get woken up fully.
And if nothing else, labour and hospital stay is a nice break from toddler parenting