Just wanted to say that, as a beginner in the martial arts, you would have an easier time learning this stuff, since many teachers would have to undo years of ingrained habits (moving without IS).. Since there's a fundamental rewiring that has to take place, simply getting past the muscle memory from non IS driven movements can be maddening, and get in the way of learning this stuff.
Get exposed and started as early as possible
I agree with Rob on this. I think as things go forward, this problem (if you look in the archives I already mentioned this) is going to turn out to be one of the major obstacles. It's extremely tough for someone with "many years of experience" in non-I.S. movement to changeover to full I.S. movement. Usually what you get is a partial change, at best, or more probably the case that I mentioned in another thread where someones moves pretty much as they always have and insert some coarse usage of jin/kokyu where they need it in a technique. My experience leads me to bet that this partial approach is going to be the commonest result of "internal strength".
My experiences in a number of workshops over the years is that if a teacher and students come, the well-patterned movements of the teacher(s) tends to slow them down more than newby students.
Very hard-style arts' practitioners can be a worst-case scenario... you can look at it as a case where they have to unlearn so much that it actually puts them further off-base than a newby. In some cases, I have actively (but politely) discouraged some people from coming to a workshop. I thought it would be a waste of their money and the class' time.