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oh god, I hope Pomu knows how to carve a pumpkin.
Ok here is what you do.
You can either draw on the pumpkin with a sharpie, or if you want to avoid black lines, you can use another method. It shouldn't matter because the pumpkin is shining in the dark anyway people just see the glow.
Usually I use a sharpie to draw a circle around the stem. Make sure this circle has a big square "notch" in it so it's not totally symmetrical and it will serve as a lid.
Step 1) Draw the lid
Step 2) Cut open the lid
Step 3) Scoop out all the insides with a large spoon.
* You want to scoop out the insides so there's no slimy dangly bits left. Your hand and arm will get slimy doing this. You can scrape the inside of the pumpkin to remove the dangles, but be careful not to scrape too much or you'll go through the pumpkin. Also super thin places on the pumpkin will emit a faint light, pumpkin artists can use this for "shading". Basically don't be afraid to scoop out the inside but also don't go too far.
Next you want to add whatever your design is to the face of the pumpkin. You can either draw it on with a sharpie, if you're really that bold. Or a better method is to draw it on a piece of paper, then tape the paper to the face of the pumpkin. Then you get a poker, and stab the pumpkin all along the lines. The poker can be a long pointy piece of metal. Or pumpkin kits will give you plastic ones. You stab all the lines essentially "tracing" your design onto the pumpkin.
Finally, get your saw out. Pumpkin kits have a small serrated saw, or you can use a serrated steak knife (although it can work it'll be hard to do small curves and stuff). Then you use the poker-holes you made as both a reference, and assistance as you carve the design. The holes actually assist the knife a little bit and make it easier, as well as being a guide.
If you want to do "shading" as mentioned before I can't help you, but that's something pumpkin artists do.