Just remember to not be hard on yourself and just let it happen.
I think it is great that you have your sister to help you through the newness of vaping.
Welcome to the ECF!
+1. Daisy, congrats on jumping off the cliff with us and making "the switch". Remember, this is vaping, not smoking... and it's not like AA where if you screw up you have to turn in your chip and start over. Every time you vape instead of smoke, you win! Many, many vapers here (myself included) started just to 'cut down', or wanted a PV just for those times and situations where we couldn't fire up a .....
Example: I turned on my boss's wife to vaping. She had no intention of quitting, but she works at a day-care center, so it was something she could do at work & not have to take breaks, worry about the smell, blah blah....
2 months later, she admitted to me..."well, yeah, I haven't had a real cigarette in a week". It happens by accident. If you break down and actually burn a stinky, don't beat yourself up over it... just give it time. Trust me.