Lapua cases and military cases are good examples of what a good anneal color range is. I use a method similar to JE, but I set a pan of water below a 2x4. I then set 1 case at a time on the board, above the water and heat it up, then knock it into the water.
Using some old cases for the first few really is a good idea. If it has been a while, I still do just that, and I have been annealing my own brass for the better part of a couple decades. If you are anal about absolute accuracy, anneal every 3-4 firings. If you are a little lazy like me, anneal every 5-6 firings
Of course this depends on your brass, chamber type, shooting style, ect... Also, your Reloading Dies have a huge impact. Some dies drastically work the brass, way more than strictly needful, just to "Make Dang Sure!". Investing in a good set of Redding Type S dies or equivalent can help you extend the number of firings between when you NEED to anneal. The Redding Type S can also help you dial in neck tension and greatly improve your accuracy.
By the way, the big 2 reasons you anneal, A) to extend brass life, B) to have uniform neck tension. As brass "Work Hardens" it develops a bit of "Spring". When that happens, you get erratic neck tension, and "Unexplained Flyers". Cracked Necks are usually a sure sign of brass that was not annealed in time, work hardening set in and eventually the neck cracks due to being too brittle.
The reason JE prefers the cases already in the water is to Make SURE that you can not Anneal too much of the case. I have used both methods, and using "my" method you really need to be careful, or you will completely ruin brass. If you anneal TOO much, you can get case splitting and hot gasses can come back at you. So, in all honesty, JE's method is safer, just don't leave the heat on the brass too long or it will become too soft and the brass is ruined.
Sorry for the book, Annealing is fast and easy once you get past the first couple times!
Gary