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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
Did you get a pre-programmed MDBT42Q? If so you should have been able to just program it with Bluetooth if you needed? Also, Adafruit do sell the Espruino MDBT42 boards in the US now: https://www.adafruit.com/product/3876
I don't actually see any capacitors on the board for the power line? - I guess it's possible that without one the nRF52 behaves a bit unreliably? Especially if running off a CR2032 it'd cause you a bunch of trouble.
Interesting about KiCad too - I really need to give it a proper try as I'm still on Eagle, but having spent a bunch of money on various Licenses I'm now still using quite an old version.
Buy a cheap one, a syringe of solder paste, solder wick, flux and some good tweezers - it'll probably cost you less than $120 all-in and it's such an amazingly useful tool. I use mine all the time now. Even if you could do stuff with a soldering iron, the hot air often makes the end result look tidier.
0402 isn't too painful to do with paste - but yeah, with a soldering iron I bet it's a nightmare!