i have a 22 month gap (ds-2.1, dd-3months). mostly it is fine, sometimes great. dd adores ds. ds ignores dd. Main problem, that i have had with both mine, is that they won't be put down. but a sling takes care of that. sometimes I have to carry both, and then I am a bit grumpy.
and honestly, it is easier than being 35 wks pg with a toddler. that is just exhausting.
cut your expectations right down. as long as everyone is fed and breathing at the end of the day, you have done your job. if you have actually got them to the park, you are a truly fab mummy.
don't compare to others. they may have more support, easier kids, etc. or if not they are probably too smug
a morning routine is good. I get me and dd dressed while ds is in his bath. (there is nothing wrong with having 2 or 3 baths a day, btw, if they like it! It keeps them in one place, they get to play with water with minimal mess, and you can sit and feed the baby)
Agree get out by 10 most days. but come back for lunch if thats easier, then let ds play. this is what we do, but my ds is still young enough to need watching cos he runs off.
And there is nothing wrong with encouraging quite a lot of independent play from your ds.
And if you possibly possilby can, have some time with no children. I've only just managed this but it is really really worth it. Just watching tv with baba asleep on your partner and ds in bed-thats all I get (and not every night) but makes such a difference.
I felt exactly the same as you 4 months ago, + Im taking them both on holiday alone next week, so don't worry, you will be fine.