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Step 1: consult Supernatural Wiki. Check!
Sharpie? Check! OK, go!
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It helps tremendously to use a bit of string as a guide for the pentagram and circle; you can get a bit freestyle-ish with the sigils, but you want nice tight corners on your pentagram. (And make all your sigils look like happy sigils.) I don't have to tell you to draw on the BACK of the rug, right?
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It also helps to let each stage (circle/pentagram/sigils) dry for about 10 minutes in between each one; Sharpies are permanent, but can be a bit smudgy when fresh, and you are a) walking on this thing to draw it because it's too f'n big for the table, and b) going to put it INK SIDE DOWN on the floors you are renting. Do the math.
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Ta-dah! The living room is now way more demon-proof than when you started. Zombies, though...that's another matter. Let's just say there's work to be done.