I have to ask. What does running a coil below 1 ohm have to do with knowledge of vaping?
This. What you said gave us no idea at all of how much you've progressed. What battery are you using? Do you test with an ohm checker that has a 510 connection or use a multimeter? What resistance coils are you using and how many amps does your build pull? How do you know for sure that your battery can handle it? How often do you check your voltage to make sure you're not over discharging? How do you carry spare batteries?
These are the things that will signify progress. Any idiot can watch a YouTube video and wrap a sub ohm coil. It's not safe, but that doesn't seem to stop them. Progress is knowledge and judgement. If you've progressed quickly, you can answer the questions above immediately and without thinking about them. If you can't, you shouldn't be vaping sub ohm coils until you can, because you don't know the things you need to know in order to sub ohm safely.
Without proper knowledge, sub ohming is dangerous.