Yay! A cool Chemster!! Firstly , if you have any problems, post on the chem 1/2 board and I'm sure someone will answer you!
Chem, was like one of 3/4s in year 11. I had to put a lot of hard work and practice into it, with my brain saying " if I don't get it now, I'll never get it in 3/4" . The 1/2 course is largely connected to the 3/4 ( ie. the first 5 chapters are revision of year 11 concepts). So I personally wouldn't neglect it. And as you are passionate about science, I don't think you will.
I had a heap of trouble doing moles! And I think it's best to tell you that it will take time to grasp onto the concept and a lot of practice. It's a tough topic , so don't worry and just do a lot of practice! I took me like a month to grasp it!
Experiments, i think, are the best part of chem. especially titrations, which you do in unit 2!!
Good luck!!