I started really focusing on my catch and have found that my arms/shoulders are fatiguing (getting better every swim, but still, it surprised me since I lift weights and am strong). Before I began working on this, my technique was a decidedly "dropped elbow" swimmer. By keeping my elbow higher, I find my stroke is more efficient and I have a more effective glide in the water.

There's a lot to remember---hand entry, hand/elbow position, when to start my catch, and then the pull. Is it easier to break it down and add on as you make the improved technique part a "mindless" part of your stroke? Any tips from those w/decent technique---the most important thing I should focus on?