at less than $2 each, they really are amazing.
now, i'm having to build out PCB's to support everything (including the voltage regulators to 3.3v and 5v), as i've outgrown breadboards.
Could you link a couple of links to resources you found useful? I haven't look at it properly but when I try to search I was a bit confused and not sure on where to start
using the arduino environment, i had a circuit up reporting temperature in less than 5 minutes.
i recommend buying the esp-12e, and the first one on my search comes up at $1.97. note, these things aren't breadboard friendly out of the box. if you want that, buy a huzzah from adafruit or buy one of the breakout boards on aliexpress (17 cents each or so).