At this point, I believe that it is too late to change your placement... But perhaps during a time that HE schedules, take a minute to discuss the requirements of your practicum. Explain that you are REQUIRED to do certain things, and discuss how you can achieve them.
I do not think this is disrespectful, but if he does give negative feedback, you have all of your blogs and discussions with Dr. Pyne to document your frustrations throughout the semester.