I agree that practice is valuable.
Proper learning has to be a combination of both, and jay5 has it right on the money He read up about a technique, then tried it-- failed once, but learned as he went. At some point in time he probably had a tearout, but 'felt' what he was doing wrong, and continued with the rest of the rout just to keep practicing the technique. By the end of it, he probably went, "AHA! Now I see what you need to do."
It was a combination of having read up on something and THEN trying it out in practice. You can't JUST practice and expect to progress at anything more than a snail's pace (though of course you WILL progress... that's the nature of practice!). If Drak only wants to learn by practice, that's his prerogative. It's a valid way to learn. But it's not the quickest, and nor is it the ONLY way to learn. By the same token, and even moreso, you can't JUST read something and expect to be able to do it right out of the gate.
There are those of us who simply don't have scraps to practice on a million times. I don't know if Big D is one of them, but I sure am.
In the interest of both demonstrating my point AND contributing to the thread--
I have only worked on one project so far. No "practice practice practice" for me, and no scrap wood (other than construction lumber, which hardly counts) to practice on anyhow. BUT, because I'm very deliberate, ask a lot of questions, and try to apply what I've read as I go, I've had successes so far. Any small tearouts I've had have been from ignoring advice and (one of Drak's well-taken points!) being impatient. Techniques learned and then applied:
1. roughing as close to final shape as possible
2. 'back'-routing sensitive areas in tiny tiny passes
3. listening to and feeling for the router's motor's performance
----
I'm sure it goes without saying that you need a sharp bit, too. Otherwise you just have a thin "not so sharp" bit of metal banging into the wood and removing it by brute force.
Greg