Speaking as a beginner, one reason one would start with galvanic instead of blend is the timing. Galvanic is slower and it gives one an opportunity to get used to doing an insertion, watching how the skin reacts, and there is more room for error with treatment settings.
I went from 60 seconds per hair on a given area with galvanic to 7 seconds with blend. I found it a big hurtle to overcome, to get the coordination down enough to safely treat the hair in 7 seconds. On the bright side, going from blend to “slow” thermolysis wasn’t too hard, and the jump from slow thermolysis to microflash even easier.
Especially without personal instruction, it takes a lot, and I mean a lot, of practice. But if you stick with it long enough, and don’t get discouraged, you’ll be surprised what you can accomplish.