Congratulations on your baby :)
But ouch! You have my sympathy - been there, know how it feels!
Some good advice on here, especially wrt painkillers and toilet paper, but also I'd say
a) add a load (and I mean, a load!) of cheap cooking salt to your bath. You (or your dh!) can pick up 2.5kg bags in the supermarket for about 50p, so it shouldn't cost much, but the salt in the water really helps with keeping things clean and the healing process
b) DON'T sit on a donut cushion - try to stick to firm surfaces. I had a donut after my first episiotomy and afterwards my gynae explained that stitches actually need support. So sitting on a donut, which means that the stitched part of you is just hanging in mid air, leaves all your internal organs pressing down on the stitches but nothing helping them to press back up again (if you see what I mean). She said it would be more uncomfortable in the short term to sit on proper seats, but much better for the healing process. And I definitely recovered faster from dc2 and 3 when I ditched the cushion :)
c) Keep an eye on the infection, and watch out for any white gunk etc in your blood. Its hard to know the first time round, but anything that doesn't smell completely clean, or looks at all gunky, is not good news, and infections can travel fast. I ended up with a massive infection in my uterus because my episiotomy stitches got slightly infected and wasn't treated fast enough. If you're at all worried, go to your GP - they won't think you're being silly.
Otherwise, good luck - it does heal faster than you think it will....and enjoy your little one :)