Huge Mistake: Cast Iron Skillet

I scraped out the remainder of my Blackberry Cobbler, scrubbed the skillet clean and threw it in the dishwasher. I pulled it out the next day and realized:

Apparently, those instructions on my skillet that said soap and dishwasher can "damage the finish" actually means "do not, under any circumstance, use soap OR the dishwasher." My pan was so rusty, I thought I was going to have to throw it away and take the trash out before Vasily got home so I wouldn't have to explain to him that I'd bought a one-time-use skillet.

Instead of throwing the skillet away, I thought I could try to take Laura's advice via The Kichn.

Turns out, all you have to do to get from this to this

is scrub the rusty ol thing with a little warm soapy water,
dry thoroughly,
lightly grease with vegetable oil on a paper towel.
Heat your oven to 325,
put the newly clean, greased pan upside down in the oven for 1 hour.
Read a crazy-good book while you wait.
When the timer goes off, finish your page and turn the oven off, open the door to the oven.
Let it cool down, then take it out of the oven,

And we're all back in business!

Am I the only one who has done this? What have you learned the hard way?