Once you have eliminated all software issues then do some practice maybe with some old broken electronics possibly before attempting on your nodemcu as I said it does take some practice to get things right. Maybe even lookup some videos on youtube etc excellent resource for putting a picture to all of this stuff but even with the pictures and videos skill building and hands on never hurts.
Curious to see how this all pans out for you It could be a number of things but in my personal experience this is what it has been. Win or fail please share your results as it may aid someone else.
Be sure also to check your windows device manager look for a serial mouse driver this sometimes installs for me and causes conflict.
Finally you can always load up a serial terminal like termite and see what is happening ...
I am curious if your coms are set at the correct speeds and settings and if you are positive you are using the correct com port you could also try switching the port in the case there is a conflict.
Make sure you have the driver as well:
http://kig.re/2014/12/31/how-to-use-ard ... emite.html
If all else fails thank god these things will not break the bank when purchasing them they are very fairly priced for what they are able to do we can credit a lot of the developers and hackers that originally started this all off for having such a tool at such a price.
Where I buy my ESP8266 boards from... (Banggood)