wjb10776 I have been using that process exclusively for my NETs.
Get your large container ready, I use a saved Wizard Labs 250ml nic bottle with a child proof cap. I recommend this kind of thing because it is loose tobacco with a mix of vg/pg so the cap is just a good idea. The bottle is due to the thickness of the walls and also because it is a dark black bottle.
Now I personally haven't got enough vg or pg in it to make 250 ml of flavoring, maybe half that. PG works faster than straight VG. It took about two weeks to get basic flavor and coloring, a month and longer really brought out the depth of the juice.
Get your liquid in there with your tobacco and shake it a bit. Please don't grind the tobacco into a powder, just let it float as is. You don't want to have to get overly serious with cleaning that out so keep that in mind if you're on a budget like me
That's all I do, just put it up out of harm's way (ie my cats or grandsons). Cartomizers work to a point. Two, maybe three refills. I just got a rba, and I now see why others have done it this way. Just...mmmmm.
Hope this helps out. Enjoy your flavors, they will smell and taste like they do in the pouch or tin. Be careful and responsible though. Don't use leftover butts or in cigs. Others have found it's not an enjoyable taste.
Happy waiting lol