I was recently approved for the DTV by the London Embassy - soft power.
It wasn't an easy application for me. I found the uploads difficult. I diligently printed out pages and pages of bank statements but, in the end, could only upload one page - a summary of my current account.
Following my application, I was asked for evidence of my flight. I hadn't bought one as had been told it wasn't necessary. I then felt I had to buy one that left within three months, which was earlier than I wanted to leave, due to the time limits outlined on the application page.
The Embassy then wanted an eticket. Norsk does not provide them apparently and, in any case, I couldn't get through to them. I rang the Embassy and explained the situation. I then cancelled the flight and bought another ticket that leaves in 4 months' time. The Embassy employee said that would be OK as long as the start date of the course corresponded to the departure date.
I also had to send another photo taken with my phone. That was also rejected and I was asked to resubmit it - a glitch in their system it seems.
Anyway, I'm writing this just in case any of it is useful to someone else. I found the whole process a bit of a nightmare, despite the form itself not being too difficult. I found being able to speak to someone at the Embassy helpful.
All the best!