I love my Wilkinet and although I don't intend to have anymore I cannot bear to part with it. I found it fantastically comfortable and the straps are simple once you've got used to them. I even managed to soothe my niece off to sleep for hours in it which was miraculous.
I have this one and I find it very good, ds3 falls asleep in it and then I can just lean forward, put him down. slip the sling over my head to take it off, put it over him like a blanket and sneak off!
i had c-section and for first day or two struggled to pick baby up. but could if moved really slowly (in hospital so baby in tupperware bowl next to you) after that it was fine. I didn't use a sling though. just carried her.
I started with a baby bjorn, very comfy initially, then used a ring sling and now have an ergo, which can be used from birth with a newborn insert, I used mine from 5 months and ds is now 23 months and I can still walk a few miles comfortably.(If your toddler's not too heavy, you could carry him/her and push baby).I could lend or sell you the baby bjorn or ring sling, or there are sites where you could hire an ergo to see if it suited you, I suppose it depends on your lifestyle as to whether a sling/carrier would suit you, we tend to walk or cycle 98% of the time so I've found mine invaluable.