Mostly through using software timers that use splits. But for a while I used a stopwatch, and then I always looked at the timer before putting on the blindfold.Dumb question: How exactly are you guys finding your splits? Video yourself, or looking at the timer right before you put on your blindfold?
Videoing is great, but it takes too long if you have to go back and review each solve. Videoing is mainly good for looking for ways to improve the physical solving part.