It's not that hard, and if I can do it, anyone can. What helped me most was watching Ack-Ack's recordings. The important thing to pick up right away is that you need to remember is that among fighters, you've got the (arguably) best gun package. 4 50 cals and 1 cannon is nothing to sneeze at on any plane, and they're center-mounted on the p38. Add to that wonderfully gentle stall characteristics, and you can do some damage.