Thanks so much, space! A few questions:
1. What is the big huge cylinder at the bottom of his? Is that his battery?
Not sure what you are talking about. In the video? He is showing a 306 atomizer for reference, as it is easier to show the bridge. Different design, but same concept. Please clarify what you mean if that didn't answer your question.
2. How long does 3 drips on an atty last?
5-10 draws YMMV
3. Do you have to replace drip tips and attys? If yes, how often?
Drip tips are replaced when they break. They can also be washed. Attys can last some folks months with proper maintenance. They can be cleaned and some can be refurbished.
4. If I used a flavor on an atty and then I wanted to switch flavors, how does that work?
Just drip your new juice on top of the old one, and the there will be a transition period. Some, like myself, use an intermediary juice. Something soft with a very light flavor. I have found that Mom and Pop's Cotton Candy works well for this.
Sorry if I'm being an idiot

, but after 3 1/2 months, I still don't know much about this stuff except to stick a cartomizer on a battery and vape!
Pshaw! No trouble! That's what ECF is all about.
Thanks again for the info and for going out of your way to get the pics and video for me. I really appreciate it!!
You're very welcome.