I have DD1 age 2.4 and DD2 age 6 weeks. DH only had 1 weeks paternity leave so I've been on my own with them since DD2 was 1 week.
It's hard sometimes but nowhere near as bad as I thought! Yes, DD1 watches more tv than she used to, but she's also got into doing lots more things like colouring, sticking, jigsaws etc that she can do on the coffee table sitting next to me while I BF. I find generally our mornings are slow and she watches milkshake while I get dressed, breastfeed DD2, drink gallons of coffee etc. Then I try and get them both in the pushchair and out of the door by 10ish, and we do something whether it's go to the park, to a friend's house, to town etc - that way DD2 naps while I spend time with DD1. Then we get home for lunchtime, usually either me or DH has made a sandwich ready in the fridge, so DD1 eats that while I BF DD2. Then thankfully DD1 has a nap for 2/3 hours while I usually end up feeding DD2 some more while collapsed on the sofa and if she falls asleep I might manage to do some dishes/tidying or have a nap myself!
Usually in the afternoons we mooch about at home or occasionally go out to a friend's house,. DD2 is now getting to the stage where she will sit in her bouncy chair for short periods and watch me while I cook or clean, and thanks to the good weather DD1 is happy to play in the garden. Dinnertime is often a bit chaotic as that's when DD2 starts getting fussy and wants to feed for longer, so again I try to make sure I have DD1's food already prepared, usually our leftovers from the night before, or something trhat I cooked and froze while I was pregnant. Thankfully DH gets home in time for bathtime and to cook our dinner!
I think the best advice is to lower your standards a bit and don't expect to get all the housework etc done as well as looking after the kids! Our house is generally a tip and gone are the days when DH would come home to a cooked dinner! We both pitch in to do cleaning at weekends and mealtimes during the week are generally something simple like fresh pasta and sauce or jacket spuds.
It also helps to be prepared, so do things like make DD1's lunch the night before, and during the last few weeks before the baby is due try and stock up the freezer with meals for DD1 and for yourself and DH.
Oh, and I second that BF was so much easier second time round. DD2 is exclusively BF unlike DD1 ever was, and it makes it so much easier as once she's fed I can just bung her ibn the pushchair and leg it out the door without faffing about bringing bottles etc.
Oh, and a sling is great too - DD2 asleep in her's now!