I found 2nd year kin a bit harder than first year, specifically Musculoskeletal anatomy, and the two physiology courses. It's definitely do-able, but it does require a bit more work. Musculoskeletal anatomy requires you to really keep up with the content, but if you do, it's not a problem.
The other courses are similar in difficulty to first year, but it all depends on your interests and strengths.
I have some 2nd year textbooks, if not all the ones you'd need, and I'll sell them for much cheaper than Titles would
PM me if you have any more questions