Once you can master a DIY calculator (I use juice me up), it's a piece of cake. The calculators take all the variables into consideration, forcing you to consider all the variables. Once you understand all the variables, then, yes, it's very easy. I've heard some good things in this thread, and some things which are completely inaccurate.
I take it that you didn't like my "DIY starter kit" contents?
It's Ok. I came to this from a background of amateur chef and pretty good homebrewer. I can usually eyeball measure a teaspoon of anything and almost any fraction thereof, so a lot of graduated cylinders, beakers, pipettes and whatnot was overkill for me.
I should recognize that not everyone would be able to do that with confidence.
I actually find the percentage method of communicating recipe formulations easier than actual measurements of ingredients because that lets me transfer the recipe I'm trying to my target nic strength and batch size. I tend to make 10ml at a time and undershoot the percentages of flavorings. Then I can tweak the flavor 1-2 drops at a time until it's close to what I thought it should taste like.
That was a lesson I learned the hard way.
I have a bottle of a tobacco flavor that used way too much Virginia Tidewater flavoring and now I have a 10ml bottle of what I call "Christmas Tree." I mean... It tastes like sucking on a Virginia Pine...

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