I usually don't, I'd say 80% of the videos I make are problems I have not done. If it's a long problem or long video, I'll work it out first, but, then work it out on the spot while I make the video.
I think the most important thing is for people to learn how to learn, learn how to figure out the problems, so I try really hard to do everything from scratch when I make my videos.
I never just look at what I did and make a video.
I guess this depends what kind of video you are making too, mine is a "how to" type channel so the goal is to teach people how to solve math problems.[DOUBLEPOST=1416467505,1416467420][/DOUBLEPOST]Note the only problem with this approach is mistakes, and I guess this applies to any type of video. Mistakes are bound to happen. Since I use zero editing it's a problem for me.