Math has always been slow and arduous for me (never in my life have I completed a timed math test and find certain aspects of calculation difficult). I knew there was a pretty heavy research focus in the program overall (I like research, just don't possess a natural proclivity for math compared to other areas) and that the stats exams were not outrageously hard, but they weren't easy either. All that to say that I was extremely anxious about stats in grad school, with (I think) good reason.
However - in grad school I 1) had a more engaging professor 2) it felt more applicable/meaningful because directly applied to, you know, psych and research, 3) had better resources available to me that i found out about that helped me really grasp the concepts that were still a little muddy after class, and 4) also friends who were good in stats who I studied with (good life strategy: surround yourself with people who are good at things that are harder for you 🙂 ). I still had difficulty finishing tests when we had to calculate by hand but overall the class was much easier and enjoyable for the above-stated reasons and I got through it with an A ( I've never been so proud of an A in my life). I definitely still put in more time outside of class than probably anyone else in the class, but it was doable and while I wouldn't say I enjoyed it, exactly, I very much appreciated it because it was so clear that what I was doing was critical to being good at the job I wanted and once the new concepts clicked it was so exciting to be able to think about research you're reading with a better lens. That made "Saturday Staturday" every week worth it. If you do end up in grad school with some worries about stats, I've seen past posts on this forum where folks have shared some excellent resources that help it make more sense if parts of the class do prove a bit challenging (videos, textbooks, websites, etc) and you can try to balance it with a semester you have classes that require less time if you share some of the same concerns. Don't let your concerns stop you from applying- you can be resourceful and you will find your inner motivation to power you thorough the extra time you may need to put in (or maybe you won't need to put in a huge amount of extra time - there's always the chance it will be much easier than you expect!) Good luck!