I've been at zero since about February this year. I took from April last year to do it. I use a AGA-T RBA at low ohms and it hits like the proverbial freight train, but there really is no TH. Menthol, mint, cinnamon and hot pepper can approximate TH, but it's really not the same. You do get used to it though, at least I did. I was mixing some juice for a friend a few months back at 18 mg nic and vaped it to taste it. I used to love TH, now I hate it.
I also went slowly down to zero, but I found that once I got to about 6 mg switching to zero from there was easy. Best of luck with it!