Honestly, I really don't think it's too feasible to work while you're in the program unless you're in the 5-semester option. I think they specifically added the option because many students also had this issue and wanted more flexibility. I tried to keep my scribing job for at least one shift per week, but I got really overwhelmed. However, I also enrolled in this program as a way to prove myself academically and make up for how I performed in undergrad, so I was also under a lot of pressure and felt like it was better for my mental health to just wait. There were still some students though who worked throughout the program and made it work I think, I just don't know them personally or how the actual courses ended up going for them. I think you could maybe pick up some low-commitment shadowing, especially after biochem ends because it's only the first couple of weeks. By then you'll get the hang of things and figure out how to navigate the overload of content. I think its completely do-able for the 5-semester option though. Just try to get through the lectures once and then after that anki will be your best friend.
Biochem might hit you kinda hard because it's the first class and a lot of students don't expect things to get started right away, but I didn't think the actual content itself was too difficult. It was definitely A LOT, especially considering it was the first week, but they really try to mirror med school curriculum. As they say, it's like trying to drink from a fire hydrant. I would recommend brushing up on the content a little earlier if you can.
My favorite part of the program is the professors. My undergrad was full of professors who seemed to hate their jobs and then let it out on their students. This program was the first time I was actually told that I have potential and thus ended up doing significantly better in all my classes. Go to all the office hours (also great for LORs but you have to ask early lol) and really take advantage of these immensely knowledgeable teachers that genuinely want you to reach your full potential and do well.
I hope this helped! Feel free to ask any other questions and I'd be more than happy to help. Best of luck everyone!