DD was 23 months when DS was born by c/s
DH had 2 wks off work & then went back (he works away Mon am to Fri pm) The hardest bit was finding ways round no lifting for a few weeks, but hopefully you won't have to contend with that.
MIL had made loads of "I'll come over & do cleaning, cooking, washing, shopping, take DD out" etc, but eventually got round to visiting us for a couple of hours when DS was 10wks old (She's last seen him in the hospital...)
My parents are both dead & we've no other family local so I was basically on my own.
It's hard work, but like others have said you will find a way of coping & a routine that works. DH used to laugh at me when I got the breakfast pots out the night before, but it's surprising how even tiny things like this can make a difference.
DD also started preschool 2 mornings a week when DS was 2 months old - definitely worth considering, it made a huge difference to me.
Also as some one else said, let your standards slip a bit & if anyone comments hand then a duster!
Just wing it, don't stress, take any help that is offered, it's one of those "you will cope because you have to" situations