GIMP gif animation tutorial

A gif animation tutorial using the GIMP program. So you just get an idea how I do the animations.
You can see the animation here
Part two: here

Sorry if there are mistakes... If you have any questions I'll explain and add them here to make this tutorial more complete.

Edit: Changes in the new GIMP (2.8):
-You can use the "smooth stroke" option to draw nice lines even in lower zoom then 200%. (you find it at every drawing tool options dialog)
-You can add all the layers you need for one "frame" in a "group layer" By doing so, the "playback" will play the group layers and not every layer separately. (And you won't have to delete the sketchy layers every time or merge them often) In the end before exporting, merge the layer groups one by one by right-clicking on them and choosing "merge layer group". I have a script that does this automatically for all layers. I don't remember the link so just google it
-This is something that was in the old GIMP too, but I haven't mentioned it here: For every "frame" (layer or layer group) rename it with "(100ms)" at the end. If you want that frame to be slower add a bigger number then 100, if you want it to go faster add a smaller number. If you want ALL layers/frames to have the same speed, in the last window when exporting, choose the speed you want at "Delay between frames...100 milliseconds" and add a tick at "Use delay entered above for all frames"
-When you finish, you EXPORT it as ".gif" and not SAVE it.