I'm starting treatment soon, it's so scary. Does it get easier?

I was diagnosed with a few different mood disorders as a teen when things first got really bad. I ignored the signs of OCD because adding another disorder on top of everything that almost made me attempt felt like too much to acknowledge. I just didn’t want to believe there was more that my doctors didn't catch. The woman that diagnosed me said I was "borderline OCD, just not all the way there on a couple things" but there's so much I didn't tell her that I think if I did I would have left with a diagnosis that day. But I need to get help, I know that CBT helps me, it got me out of the darkest point of my young life, but ERP sounds like it's the only path that leads to real healing. I'm so scared to finally get diagnosed though. I was convinced for a while that I have it and one of my family members might, and she just got diagnosed. I know I need to do it but I'm so scared I'm just gonna traumatize myself by finally getting everything I've never told anyone out. I'm scared I'm going to find a doctor I think can help, and they're gonna think I'm a total freak. I just need to know from people who have done the work, I know it's gonna be hard at first, I know it's gonna be draining and awful. Will it get easier? Does it take months, years to feel okay leaving a session? How did you know when it started helping?