It all depends on YOU, the more patient contacts you get the better you will feel about doing patient assessments and being confident in yourself. I was lucky when I got into EMS I was with a busy system so once I got through my Basic FTO program which was 6 weeks, (WOW that was a long time ago), I felt confident towards the end of that. When I went and got my Medic, I had worked over 6 years as a basic so that transition to medic, so talking to patients and ER Staff was already there, and it took a few months to be completely confident that I was ready to run calls on my own at the Medic level.
It just takes time, ask questions to your Medic partner after the call and take the advice he/she gives you, and do not forget to continue to learn, most of your patients will teach you something new. With you doing a lot of IFT, you should have the patients chart, so you can read and see what medical conditions the patient has been Dxd with, and than look at the patient and see how the patient presents with those conditions.