Well, I will say this. Your piece is something you will be working on for a long time. Just like my backswing piece is something I will probably be fighting for the rest of my golf career. I have taken thousand upon thousand of bad swings before getting lessons from Erik. I have spent about 6 months on my new piece, and it is better, but not there yet. It still falls apart sometimes during the round. Like last night when I almost had an in course OB with a snap hook.
So, here is how Evolvr will probably go down for you. You will get your first lesson. Then I would use the next three to send in video of you doing the drills. Then the beginning of the next month I would send in a new swing video, then 3 more of doing what ever drills the instructor is telling you so you can make sure you are doing things right. Just keep at it till the piece is in a better position.
Honestly the only thing that changes fast are set up changes. Swing changes usually take a long time. Which most people don't get. They assume they can do the drill for a week and then the next video looks better and they proclaim it fix. Then it falls apart. Nope, not how it works.
Heck, Erik has been working on a transition piece in his swing for about 3 years now.