@Bravesst : the Zion is by far the fastest vaporizer to prepare that I own. It's way faster than rolling a spliff: I just grind a fine line by hand in my left hand palm, allowing me to judge easily the quantity, then I grab one of the glass stems and I suck the line inside the bowl/screen in one pass. Afterwards I just plug the stem in the Zion, turn the power dial to about 80%, press the trigger and count to 5, then finally start inhaling and I get vapor. Voila! Near instant gratification!
Don't worry about the technic too much. It's really just a matter of counting the time you press the trigger when you are used to it (ie don't be distracted and hold it for 30 seconds or the inverse, being too fast and holding it not enough)
Surprisingly the temperature stepping is achieved almost automatically. I mean, it's really "organic". Even if you don't pay attention to it, and even if you don't touch the power knob for the entire session and leave it as is, you will do the temp stepping just by adjusting the trigger timing and judging the amount of vapor you get. I know it's not very clear, but once you'll have it in your hands you will see.
Say if I was to do a full session on 80% power, I would need very little preheat and short draws to get plenty of vapor when the bowl is still fresh. But as the session goes on (and without touching the power knob) I will not increase the preheat time by much (as the device soaks and store heat over time, in fact I would tend to decrease the preheat time) but I will need to increase the inhalation time and/or hold the trigger for longer when hitting. This way you get higher and higher in temperature, and you know when to stop judging by the "spent" taste.