I've been mixing since last September, and it has gone very well. Did a lot of research here in forum, decided on four recipes to start with that were well rated by other mixers, made sure I had a solid list of supplies I wanted, and bit the bullet. I dove in pretty far pretty quickly because I like a lot of variety of different flavors, and I have to admit I have around 120 flavorings right now. But it's still costing me a fraction of what I spent on commercial e-liquids. 2$ for a bottle that I would have paid 25$ for? Nope, never buying pre-made e-liquid again.We’ll see. If this goes well (eg if I can mix something I like) there’s not much incentive to going back to store-bought juices, that’s true...
Start small. Find some recipes. Try to be consistent so you can get the same result again. Experiment with leftover flavorings. Find a few you want to make repeatedly and can enjoy while trying a new mix (in case you don't like it).
I have made a couple that did not work out, but so many that are very good.
Good luck!