I just need a script to be both polite and professional and escape.
I used to pick up documents for a large company. This was a very fun job as I used to drive out to small towns and visit their courthouses. A part of the company changed hands and I offered my services to the new territory manager. She wanted me to get "certified" (so that I could do the proper entering of said forms; I was being a delivery person before that) and I agreed. The next two weeks followed the most difficult trainings of my life (no hyperbole). I've given it a really good go and decided I need to let her know I'm not going to be able to do it. If I can't master the material, how on earth am I going to enter the documents?
Anyway, I just need something professional and kind. Such as, it's not a good fit.
I feel bad, but it's not like they paid me for anything. Time is too short to struggle with things (besides feeling stupid). All vagueness is intentional.