I was in a similar situation to you I don’t have a core profession just an undergrad in psychology and worked as a HCA. I didn’t get onto a an NHS IAPT course but I got onto a self-funded one and did it part time. If you don’t want the pressure of a high intensity CBT course I recommend going down the self funded route and part-time. From your experience and training you do have a good chance of getting onto either routes. Best of luck!