I thought it was way more complicated than it actually has to be.
The DIY Starter Kit
I bought it. Seemed like what I needed at the time. I don't regret it, it did set me up with sufficient VG/PG/nic and flavorings to start screwing around.
I just found mixing by volume to be a messy, imprecise, cantankerous, totally unfun bore. I hate extraneous clutter, and can't get my mind around throwing away syringes after a single use. Too much too much! All of it except the liquids banished to the closet. The Liquid Barn flavorings, though what little of them I used seemed to work well, are also fairly untouched, not because they suck, but because they're in bottles without dripper caps! I plan to transfer them when I free up some bottles, or break down and buy some.
I had to simplify or DIY would be too much hassle. So, 1 scale
Amazon.com: American Weigh Scales LB-501 Digital Kitchen Scale: Aws Digital Scale: Kitchen & Dining
1 bag of 100 pipettes (for the nic base only, all flavors and VG/PG are in dropper bottles), bottles I already have from 2 years of hoarding for the eventual DIY plunge. Everything gets mixed directly into the bottle. End of mixing session, 1 paper towel and 1 pipette go into the trash, whether I mix one batch or 10. That's an acceptable amount of waste for me.
Not knocking either volumetric mixing or DIY starter kits, it just wasn't what I needed, and unfortunately I had to pay substantially to find that out. Could have bought a lot of flavorings from Bull City for that 70 bucks.
So, 1 scale, bag of 100 pipettes (buy em when you buy the scale on Amazon, they're right there on the scale's page under "Frequently bought together"), flavorings in dropper bottles, empty bottles if you need them, paper towels. It's very low tech, and not everyone's preferred method by a long shot, but it serves for me.