Upload & Sell: On
I agree completely with justruss and molson. The "just go out and use the damn thing" school of thought is by far the best way to go, but only when you know what to look for, and you know how to do it.
In fact, I haven't used my checklist in many years. That's because I've bought, sold, and especially used enough lenses that I don't need a check list, anymore. My experience-based intuition generally serves me very well. OTOH, when I started doing this buy/sell/trade-up stuff way back in the old days, I needed all the help I could get. Some say, I still do.
IMO, people with relatively little experience in doing this, don't have enough practical experience to have reliable intuition. "Make a few photos" is fine, if you know what to do, and how to evaluate the results. Otherwise, it's difficult to make the right decision from "just go out and shoot", if you haven't done it before.
Would you fly on an airline that doesn't use checklists, because their pilots 'know how to do it'?