A warbird would be a pretty big jump from a trainer. You need to consider an intermediate aircraft with greater aerobatics capability than a high wing trainer. There is a sticky at the top of this forum which recommends basic and intermediate aircraft.

A warbird will have a much higher wing loading than a trainer. It will fly faster and land hotter than a trainer. Give your reflexes a chance to "catch up" to high performance models.

Not saying that it "can't" be done but believe you'll have much greater success doing this in stages.