I have read all the posts in this thread, and I understand the frustration of the newbies to this art. I was there myself. However, to those of you who tried, failed in your own eyes, and gave up, I ask you this: What other skill do you possess that you were able to acquire the first time you attempted it? I would wager very few.
Those who have achieved skill in machine quilting did not do it overnight. A hundred hours of practice is just a starting point.
Also, I sense that some of you have tried to run before you could crawl. Would you try to race in the Indy 500 if all you have is a learner's permit to drive? Probably not.
Allow yourself the time to practice simple things first.
Straight lines are not as easy as they look. There are tools and tricks to make it easier. Ask a teacher to show you how.
When you move on to free motion, practice on paper long before you get to the machine, and when I say this, I mean practice simple shapes, like curves, before trying to copy all the lace at Windsor Castle.
Do this and you will set yourself up to succeed.