Lollipop QueenFee is on the mark - second hand definitely the way to go with slings if you can, the more worn in they are the softer and easier to tie/wrestle with they are, in a lot of people's opinion. The Kari-me is a little more stretchy than the Moby I believe, and holds its shape a little longer between washes, according to my mate who has both. If you're feeling dedicated, you could try checking out wearyourbaby for some good instructions on how to make a variety of styles, but also have a look at slingmeet cos if you there is a local tribe of slingers who meet up regularly, there are usually people very happy to lend you theirs until you find what suits you.
waters mine broke in the back of the car when I started to want to push, and made quite a pop too. The MW had luckily suggested to DP that he covered the seat in towels, but as I was on all fours and was way past caring about anything other than concentrating on contractions I've no idea how much there was! The car seemed to have survived, anyway .
potty training we had a very easy time with DD to start with, cos she kind of did it herself at about 22 months. But she was in cloth so was aware of being wet plus had always had lots of nappy-off time so had, literally, seen herself weeing on the floor , we'd had potties around for ages so she'd got over standing in them/putting them on her head, and we only properly ditched the nappies when I realised she'd been taking herself to the potty for almost every wee for about a week. But she did go through several regressions over the last year, all for different reasons. And since I've been PG, she's been back in nappies at night (she ditched those herself four days after being dry in the day - she knows her own mind, my DD ) cos she just stopped waking up when she needed a wee and we ran out of bedclothes! Have to admit, I wouldn't want to start at this stage in the game beyond just seeing what happens when its convenient for you both, but you know what's best for you . We found that wild celebrations of success worked with DD - she was jubilant too - but then she was a bit young for other stuff like charts or whatever, and just delighted in getting our approval.