Even Anky van Grunsven, the number one ranked dressage rider in the world takes lessons. Every day, in fact.
If you think you know everything, and don't need lessons, then why are you posting a thread asking for help?
And all lessons are not taught on a lesson horse, most of the time trainers teach you on your horse.
If you look carefully at what I wrote, I actually wrote: "I've taken plenty of lessons from a more than competent instructor and plan to take more.
I don't think I know everything. That is why I'm asking for help. I just don't have the money to be take a lot of lessons right now, and I feel bad asking my trainer's advice without a lesson because she's also my friend, you know, the whole, asking a doctor friend for medical advice thing. It's tacky. Plus, I don't think her opinion is the only opinion in the world, which is partly why I posted here - to see what everyone else thought about the matter.
As for the "all lessons are not taught on a lesson horse, most of the time trainers teach you on your horse," that's not true in my case. I only got my first and only horse in September, and up until then, I had never taken a lesson on MY horse. So, while I plan to take lessons on my horse in the future, that has not been the case up until recently.
In summary, I'm sorry if I came off like "I think I know everything." That is definitely not the case. I think the word "basics" threw me off guard, because I've been riding for 5-6 years now, and I'm pretty sure I have "the basics" down. But then again, I suppose my definition of "basics" could be different than yours.