I'm one of those weird guys that started reloading so I could shoot more, instead I found a new sport. I now shoot so I can reload! Any excuse to shoot.
I use a chronograph, an Oehler M33, so I can see changes faster. If there is a sudden or unexpected change in velocity, I know there is at least twice as much, percentage-wise, change in pressure. I don't know the pressure, but I know there has been a change, it never goes down, when I use more powder.
The consensus is to do things consistantly. The actual things each reloader does may be different, and their tools may be different, but the do it EVERY time. If something you do turns out to have a problem, change it. That's why, after reading the manual(s), you go slowly. You can always speed up later, as your muscle-memory becomes more inplace.
Our needs are different. I shoot several guns, of several types, ie rapid pistol, target-shooting and bench-rest, varmint-class, as extremes, but also, for instance, trap-shooting. You would have other needs, therefor, would do things slightly different. Just don't rush things.
Have fun,
Gene