We had a class on shiho-nage last night. Shihan Sam broke it down and we worked on footwork, entry, positioning, timing, posture, and more. Every time we have one of these classes where we take one technique and work on the details I come away feeling like it was the first time I had ever seen it.
Shihonage is the foundation of Aikido. All you ever need to master is shihonage.