When I first learned to bend EMT I was taught the "guess and bend" method for offsets, and didn't believe in using tables and formulas.
The person who taught me would bend an offset, check it, bend it again, check it, and usually by the third time it would fit.
Suffice it to say it drove me nuts to do it this way, especially on old work fire alarm jobs that needed lots of offsets and multiple bends. It was extremely frustrating.
Recently, I've learned the Benfield method in school and find it to be far more precise. I can now bend a perfect box offset every time, which is very satisfying!
How do you do it? Any tips for making nice bends?