Use this 3 step approach:
1. Pretend Heading=OBS (i.e heading = 255)
2. TO indication = You are flying towards the VOR (so on radial 255-180=75 if centered)
3. Fly LEFT = you are right of radial = lesser value.
Now to get 2 dots to a degree you need to know if its a 5 dot, 6 dot instrument
assuming 5 dot:
5 dots=10 degree
2 dots = 4 degree
So radial = 75-4 = 71..
For graphical, try setting it op on This:
Tim's Air Navigation Simulator