Pro tip: That time I tried to fix a boiler myself during a snowstorm
I was in my basement in Cleveland about 3 years ago, middle of January, temp was like 5 degrees outside. My old steam boiler started making this banging sound and then just shut off. I thought I could save a few hundred bucks by fixing it myself. Looked up some videos, figured it was the low water cutoff. Spent 2 hours draining and cleaning it, got it all put back together, fired it up, and it dumped water all over my concrete floor. Ended up calling an emergency plumber at 10pm on a Friday. He showed up, took one look, and told me I put the gasket on backwards. Cost me $450 for a 10 minute fix and a new gasket. Has anyone else made a stupid DIY mistake that cost more than just calling a pro from the start?