my two boys are 16 months apart and i agree that you need a good carrier. i used a hab up until about 6 months and then an ergo.
i also used one of those fisher price swings quite a lot, its very easy to pop the baby in there and turn the mobile on so that you can spend time with the toddler.
a double pram is a must- i used to put them both in there every afternoon and go for a walk up a dirt road. once ds2 was asleep i would head over to the small playground, park the pram with sleeping baby in the shade and then play one on one with ds1 in the playground.
overall, i found the first 4 months or so the hardest, but mainly because ds2 was a very unsettled baby. it does get a lot easier once you get into the groove of it all and now they are best mates and love each other's guts.