I usually carve my pumpkins so they will be lit for 3 days (the two nights before and Halloween night)...that way I know they will still be good for Halloween night. So, we carve them after dinner on the 29th, put them out and light them that night, the 30th and the 31st. We gave up using actual candles due to the amount of wind we get here in October, so we use LED lights now. I don't like using actual knives, but I have before...very, very carefully. We found the sturdier pumpkin carving tools/knives are best. (The skinny ones tend to break.) We have used our Dremel tool before, as well. As for scooping, a pumpkin kit scooper is what we are using now, but we have used spoons, too. I also draw my design on the pumpkin first with something I can wipe off easily, like a non permanent marker, crayon, ect.
I have heard that a little bleach water will help kill bacteria in the pumpkin to keep it from molding and I've also read that you can coat a thin layer of Vaseline (petroleum jelly) to the cut surfaces to help hold in moisture...though I have never used either of these ideas myself so I can't say if either actually works.
After carving, we do wash the pumpkins in the sink really quick to remove leftover ****, strings and tiny cuttings. I like my cut edges to be very clean and neat looking. I then let them drip upside down so no water pools inside the pumpkin bottom and dry the outside with paper towels.
The year before, we thought it might be cool to put some aluminum foil inside the pumpkins to reflect the light...looked pretty neat.