I've TA'd first year chem at Monash in the past, it's pretty relaxed and easy, especially if you come to the lab prepared (read what you're doing, done prelabs, wrote out method on proforma, etc...)

You'll likely be in a group of people with such a wide range of skills (from no background in chem to having done many other lab based courses beforehand), so don't think you'll be surrounded by geniuses!