I used NiCopp as well. No leaks and it was the first time I ever ran my own lines. I ran 3/16'' on the whole truck (disc/disc) and the breaks work great.
That tool is nice but if you only need one size this one will work great.
https://www.amazon.com/Titan-Tools-5...s%2C212&sr=8-8
Also, this tool can be used on the truck if you mess up or dont want to pull the line back out.