i'm sure there are nearly as many ways as there are people....
regarding overshooting your temp at first...... i only light my egg in the middle of the lump and i leave it open for about 15-20 minutes or until the center of the lump begins to turn white. with the bottom vent still all the way open and the top opened about half way, i close it and see what temp it comes up to in a couple or so minutes. if doesn't move much, i open it back up for, say 10 more minutes and then try again.
i can't foresee a way you will have any problems using this.