Take some vitamins, work out that thumb and you will be firing that thing up in no time !!
Actually, I found mine to be as easy as anything Ive had. Ive got a few mods and they are all a bit different as far as the fire button. If I thought about it enough, I could come up with good and bad to say about how any of them fire.
I use Provari's for the most part, but I still say the MVP is the best bang for the buck and the best back-up mod made. Period.
If I go to a festival, a Harley Rally, a camping trip, an overnight trip or vacation...that MVP is the first thing I pack.