As for the Series 7, I don't know why anyone would be frightened of this. It is a straightforward test, if you read the materials, you will pass. I studied for a week and a half, the test itself took me 3 and a half hours to complete, I got an 84. It takes a score of 70 or better to pass.
They ask questions like what is a bond, what is an option, stuff that is good to know anyways, and sorry, but if you do this full-time you are doing yourself a huge disservice not knowing this stuff.
As far as Echo's paperwork (I trade remote with them), it is about 100 pages, divided into 10 sections. If you get the paperwork sent to you from Lieber, Hold, any of the 13 professional firms, it all looks the same. So much so that I think they all copied each other.
Professional firms are always under massive regulatory scrutiny, so they have a bunch of forms that make sure you understand that you are circumventing Regulation T which is how you get greater leverage than at non-pro firms.
-Jim