NET is a Naturally Extracted Tobacco "flavoring" which is then added to PG/VG/Nicotine to come up with the NET "juice".
If I recall correctly, from reading through some of the NET threads, there is very little (if any?) nicotine in the NET flavoring.
NET's are very easy to do. A little time consuming, but easy.
I did 6 a few weeks ago and all are very vapeable. 1 is excellent, 4 are good to very good and the last is OK but needs something (another flavoring) added to it to make it better.
Here are the threads that got me started.
Tobacco extraction using heated Ethanol
Best tobacco for flavor extraction
As for the nicotine, since you are a tobacco lover, I would recommend this.
Throat-Hit Nicotine - Vapers Tek I use it in all my tobacco/NET mixes. But then that's pretty much all I vape any more.