Definitely take lactulose after the birth to soften your poo so you just don't have to worry about pooing. That stands whether you have a tear or not. Also try to let some air get to your bits whenever possible, and don't turn over or scoot your bum about on the bed too fast if you have stitches, I somehow managed to do this, tugged my stitches really sharply and it was agony!
Just to reiterate, fgs DON'T look at your bits ever again afterwards. It will look sad, knackered, saggy and may have new strange bits which you don't recognise and will scare you. (It gets better eventually!) 
Hospital has the best maternity pads. Obviously take your own good quality ones, and plenty of them, but if they offer theirs, do accept! they are way bigger, softer, wider, and they don't leak. Don't try to make do with sanitary towels, they won't be able to handle the volume of fluid lost. Think "barbie mattresses".
When you get up to use the loo after birth for the first day or so, you will leak a lot, on the floor if you aren't careful. Black leggings/tracksuit bottoms and a fleece dressing gown are your friends. Don't bother with beautiful pastel pyjamas, they will get blood on. And you will have to walk through the ward like that, potentially mopping up blood drips as you go (sorry)
Pack a biggish plastic bag or two in your hospital bag to carry all the presents/flowers and extra food you'll accumulate when you leave. And if you have older dc coming into the ward to see you and the baby, make sure the baby is in the cot and you spend time cuddling the older dc before making the introductions. A present "from the baby" doesn't go amiss either. Choose something predictably crowd pleasing and not too noisy as they will want to play with it immediately in the ward, baby forgotten. :-)