Congrats working with a service rep or doing it yourself??
I started with a local service rep who was very busy. After some research I completed most all the paperwork and follow-up required and got my service-connected disability. I used the rep to mail in my paperwork to the regional office and have a paper trail.
For Cheryl's claim I pretty much did her whole claim, including an appeal to the US court of veteran appeals in DC which she won and received her service-connected disability. We again used the same service rep for a paperwork trail.
As long as you have all your medical documentation when it happened and treatment since you'll be ok. It takes time but when approved your back dated for pay to when you first filed your intent.