The top cap may be pretty tight. You have a couple options, but the best would be to screw it onto a
mod, then pull on the top cap. It should come off by doing this. However, and this is a little more iffy, you an take a screw driver and "press" the bottom out of the top cap. Be careful by doing this though since you may scratch the inside (I recommend the first method).
Since you're using 30 gauge, I would do one fold of the silica, then doing around 6-7 wraps of the wire. Since you have variable voltage, making a 1.5 to 2 ohm coil will be absolutely fine. Be sure to test the resistance before firing it on the
mod (you may have a short). Finally, when you know the resistance, set your Provari to the lowest voltage and do a couple dry fires. You may see some hot spots but poking the coil around a little will get rid of those.