The only willpower I used was finding better vapes and not giving up. However it did take a long time, 9 months total transition, plus another year of 1 cig a month (YES that's enough to avoid certain withdrawal symptoms). I dropped to half the smokes almost immediately, but after that progress was slow enough to seem like it wasn't happening at times. However, I never went backwards. I kept count of cigs as I made them with an injector machine (if nothing else, STOP smoking Fire Safety Cigarettes, required of all manufactured cigs in the US, they're twice as bad, where's the FDA???). This also meant vaping was little increased effort, because smoking was also DIY....
Going that slow is not ideal, but don't think you can't just because others seem to have an easier time of it. I think that in my case, nicotine was only a small factor in my addiction. Vaping allowed some smoking without falling back down the rabbit hole.
My initial action was to find things about vaping I liked, even though it didn't really seem to relate to smoking or quitting. Don't try to think too far ahead. If you really like vaping -- I do -- you will want to do it, next step is having more time for it you aren't smoking.
Equipment is a big factor. Frankly, of everything I've tried, 9 out of 10 atomizers I've disliked. The shop may be right you don't have the right vape for you and yet their suggestions could be worse. I liked small pen vapes with very tight airflow, and still prefer them among tanks I've tried. My main vape is a RDA (Rebuildable Dripping Atomizer) at 14-16 watts. This has great flavor and allows for continuous changing and combining of ejuice flavors to taste, and are the easiest device to build. I use what I call a "lazy draw" which is not a tight airflow but simply not pulling hard, allowing a different kind of hybrid MTL-DL usage. I also moved into DIY, which was slow at first but allowed more experimentation with unflavored and light flavored juices -- paying normal prices sways me towards intense flavors.
It's a good question if getting better equipment earlier would have helped speed up my progress, but it was needed to fully quit.