When I moved to ITR I was not as confident as I was because of speed, RWD And just an all around different car. Usually when I go to a track I find at least one turn that I can feel safe and push the limit of the car. Within a lap or two I can build confidence in how fast I can push and what that feels like. At the Glen for me it is the second to last turn (left hander). I know I can go flat out and it's right on the edge, so I push for that same sense of grip and control in every other turn. At NHMS it's turn 6, each track has at least one spot for me that pick. I did this same thing at Mospirt and within 2 sessions I was 5 seconds a lap faster. Then after that I just needed to learn the track as I gained more speed every session concentrating on one turn at a time. Getting confidence in the car is the first thing you need to do, then go faster after your comfortable. Being uncomfortable is never a fun feeling, good luck and don't give up!
Stephen