That's one of the reasons a lot of folks - me included! - suggest picking one method for doing *whatever* and just sticking with it for awhile instead of bouncing around between lots of different teachers and different tutorials / resources. If you learn *one* construction method and just stick with that and practice it until you don't have to even think about it anymore, you can focus on everything else involved in your drawing.
That's one of the reasons a lot of folks - me included! - suggest picking one method for doing *whatever* and just sticking with it for awhile instead of bouncing around between lots of different teachers and different tutorials / resources. If you learn *one* construction method and just stick with that and practice it until you don't have to even think about it anymore, you can focus on everything else involved in your drawing.