I used to have the same problem, but no more. The solution is very simple and elegant. Buy yourself an inexpensive Federal rangefinder on the auction site.
Now go out and shoot the camera (with no film) by first guessing the distance, then checking it w/ the rangefinder. Pretty soon you'll see that 3' is quite a bit different than 6', 10' is different from 15', etc. In a short time you will be very proficient at this. Then, sell the rangefinder for what you paid for it, or keep it around in case you get rusty. Works a treat, and once you get the hang of it, it's as fast or faster than using a camera w/ an internal rangefinder. Also, f8 is your friend, especially w/ the Novar.