Welcome my friend
Just clean the small leak whenever you notice them. It doesnt explode your battery but should be better to be cleaned.
You will be careful handling nicotine (I mean liquid) It is not like nicotine we get from cigarettes. This artificial nicotine is absorbed through skin. We get it in our mouth maybe through our nostrils and it is in our system. Again it is not as fast as cigarette nicotine. So we dont want to get extra nicotine while we are
vaping.
I dont know your liquid what is the PG/VG rate but eventually your
coils will collect gunk and either be dry burned or changed (Please refer to videos in youtube to learn how to's)
Most probably you tried to get it directly to your lungs and it harts when you get into your mouth first than inhale it will be smoother. Never get vape directly to your lungs harder than 6mg/ml nic.
I wish you a very quick success. Happy vapings.