I just came across this ( http://www.mountainproject.com/v/105962116 ) purely by accident. It seems on-topic
As the question is to work layback technique, I don't think that training for flagging is on-topic. The reason is because i ask myself the question what did I want when I am working a technique. In my opinion, first, we need to know the limit of the technique, which are our strenght and the barn door when the layback is too open. Second, we can learn when it is best to use layback or other technique or two or three technique togheter.
I know that darwin is not a beginer if he wrote on neice.com under the same name, but the question is interesting for a beginer. Do they have to put all togheter technique, or should they learn the basic technique and go throught more complex situation gradually. Personally, I prefer to learn the basic to have a deep understanding of what I am doing. In that way, I can climb every where a layback technique and don't have to be accostume to the rock before.
As the question is to work a route with layback, you just have to know that it is not a layback that you must do but a flag. And the photo is on topic. Look at some one else do the route and imitate him. Personally, I don't find it fun. Climbing is useless and there is no gain to be at the top of a 5.6 or 5.10 if you like to be in the vertical world, except the social pressure. I climb to relax and to be out of competitive behavior of work. My goal is to strech in a nice environment at my level, which can be different depending on my mood. Guessing the movement with as a penalty the risk of a fall, keeping my mind open at the danger and using my imagination to find good placement for my nuts, keeping my cardiac rhytme at a low level and staying calm in stressfull situation is appealing to me. All kind of stuff that I don't find when I clip a bolt.