Great Choice on Equipment for your Mission.
Sounds like you have planned it out well and have a healthy Perspective and realistic Vision of your Journey as well as the nuances of the "Legs" of that Journey. Stay your plotted Course as it stands a very distinct Probability of taking you where you want, and need, to go.
Don't sweat the Nic level or for the time being. That chosen Facet IS working for you obviously as is. You can dial that and other Specifics later on after the Primary Objective (laying the Nails to rest eternally) is accomplished. But, if you get mired and stuck at the 5AD Hurdle, then maybe up the Nic to 16-18 to get a "push". Only when we find ourselves stuck and not making any progress does the situation demand a change in Tactic or Tool.
Sir2 has some awesome Points regarding the Mental Blocks you may be, or possibly will, encounter and tricks to overcome. The Mind is like Pavlov's Dog. It is a Creature of Habit and resists change especially when it senses the death of its Routines. Ya gotta have "treats" or Rewards for it along the way or it resists jumping through hoops and leaving its Comfort Zone. To get it to behave and especially to entice it to change behavior, it needs more than strong Resolve of Will. The Self requires Gratification. It insists on receiving if it is to give.
The little Mind-Game tug of war has to be considered and conquered right along with the Physical. The Physical is the easy part. The Act of Vaping itself along with the Nic in the Liquid easily replaces and placates that Transition. Willpower alone sometimes lacks the punch needed to break the final Hold of Habit. That's where the "treats" and Rewards come in. I used Vigilante Grey Ghost Juice as my Treat. Even after having kicked the Camel off my back for almost a Year I still had a Tank of the "Good Stuff" once a week to mark and celebrate Accomplishment.
You can also set Goals (reasonable ones with adequate time allotted to achieve) and dangle the Carrot to get the Mule to comply. I promised myself new or better Devices as Reward. Nothing like self-Gratification & Justification to bring about needed change.
Sure that has its own possibility of Issues but those Possibilities are inconsequential compared to battle at hand; Slaying & defeating the Camel or the Cowboy.
Them's some Bad-Azz Opponents and they both know us very well.
They don't go down easy or without a fight.
Enough of that crap for the day...
You'e doing AWSOME! Stay on Point, be Vigilant & Resolute in your Mission, use Psy-Ops to breach the toughest mental Bunkers and you will be victorious.
Vape On & Enjoy.