I've been lifting for around 3 years now and I still will not try to design my own routine. I guess as LTL stated though it really depends upon the individual and how quickly they process knowledge. I've seen some guys that just want to do curls and bench all day and even after they are told of the importance of leg training still don't care to put the knowledge to use and start several more threads asking for help. " I don't want to be huge, I just want to be toned and my legs get worked enough in ..........."
I'll find strength in pain.