This post is excellent and shows that it can be done with organization and a little bit of self competition.
When drills are made into a competition within yourself, pressure and tension builds as you get deep into the count.
There was a Q and A section on the new Rodney Morris DVD where he talks about training by himself so deeply and involved that when he dogged the final ball he slammed his cue and shouted...so much so that someone came up to him years later who saw that moment and asked about it.
That's the mentality the pros get themselves in.
I really enjoyed this thread, because it's a reminder of the dedication and time that needs to be invested in order to really improve. When you have to get worse to get better it can be so demoralizing... then it clicks and all the hours payoff and you find yourself far beyond where you started...Then the hunger is to keep going...so you move on to even more difficult drills.
This is why I miss young Sam from up north. His threads where really informative in that we could see just how much work it takes to accomplish anything in the game....the lectures, suggestions and advice he got from all of us was well deserved and helpful.
In the end, when he quit, it served as another reminder to all of us that train, watch, play, and enjoy this game, that it doesn't happen overnight and there is by no means a system that solves it.