Very detailed and easy to understand guide. Thumbs up! But you have just given many scammers, potential scammers and other jerkoffs many reasons to be happy. If they didn't know how to do an RBF-enabled double spend, they now have all the necessary information. Even if it's a great post, it will surely be misused. 

I still haven't upgraded my Electrum from 3.3.8 so the steps are a bit different on the old version.