Take this with a grain of salt, because it's just my opinion and one that might be vehemently disagreed with by others, but:
I began training Liechtenauer's art in 2003 all by myself. I didn't have anyone to train with. After a while I attracted some attention and got other people to train with. We had no masks, just wooden swords and a desire to learn. That's it. I kept on with this, clear through 2006. Sometime in 2006 or 2007, I got my first fencing mask, still working with wooden swords, daggers, poleaxes etc. Sometime in 2009 I got enough gear together to bout for the first time.
That's right, I had trained with solo drills and partnered drills for SIX YEARS before I felt a need to really start sparring to round out my art. Because of the way I trained, I don't have to think about what I do when I bout.
Sir Ed mentioned "Muscle Memory" but it's not really anything to do with muscles. It's getting to where you don't have to consciously command yourself to react. Imagine if, when you wanted to ride a bicycle, you had to think about how to balance. At one point you did, right? You had to think about it, and you fell frequently. Or you took a turn too sharply and wiped out. All of these things were learned by repetition in a relatively controlled environment. We don't take a 4-year old who hasn't learned to ride very well and drop him into a BMX track and push him down the first hill... that is what bouting is. Similarly, taking someone who hasn't internalized the rules of combat, and throwing him in a bout gives so many unknown scenarios (hills, jumps, dips) that he will react in an untrained and "wrong" way. Something that gets him hit and ruins his sense of confidence in his knowledge.
Now, with my students, I don't make them wait 6 years to bout. In fact, I'd not necessarily recommend ANYone learn the way I learned - ESPECIALLY if they have a school around to train at. But I do look for certain cues that my students have learned the "textbook" response to certain pressures and can react to that immediately and unthinkingly.
If you are the kind of learner who needs "words" to internalize something - that is fine. As your instructor to provide those words. For a German practitioner, it could be as simple as learning the verse. For a Fioreist, you too have shortened verse to go with each action. Pick up a copy of Tom Leoni's Fiore translation and learn those words. Chant them in your head *while* you do the action in solo drill. Then in class. Then, when you feel confident that you know basic responses to quite a few different kinds of attacks - you can use them in a bout.
Tom Leoni's Fiore Translation:
http://www.freelanceacademypress.com/FiorDiBattaglia.aspxJess