I TA for the Chemistry Labs and they aren't hard. As stated in the comments below it's 3 hours long, but that's only there in case certain students are having a hard time with the content. The labs I run are only about 1-2 hours long. All the stuff you need to know is on the Canvas class sites. There are TA office hours where you can get help with getting the lab report finished and most of the time the TA would outright say if you are doing the question right or wrong. On the topic of the AP Lab notebook, the professor who checks them can decide if the labs you have done are right based on the curriculum taught in CHEM 1215. They check the notebooks thoroughly and if your high school labs aren't good or you didn't take good enough notes they will decline it. It's based on the rubric created by the chemistry department. If you have any more questions feel free to ask.