I've started DIY eliquid. I too was worried about the complexity of the "chemistry." However, if you can follow a cooking recipe correctly, you can make eliquid. I'm only doing unflavored right now (mixing 100mg/ml nic base into PG/VG) just to get my feet wet with the measuring, mixing, etc.
I was most worried about working with the high nic base and getting down to the 10-12mg/ml strength I'm aiming for. But really, just go slow, measure things out slowly and separately. Check, double check, then mix all ingredients together. Easy, safe, and correct.
If you're still unsure about working with the nic, places like Wizard Labs (they're my go-to source for nicotine) carry pre-diluted nicotine base at 12, 18, or I think 24mg strengths. Ordering those levels can be a little less intimidating. If you "screw" up a recipe working with, say, 18mg/ml base, you'll only have bad tasting juice, not poison.