My sixpennies:
1. Check your eyesight - take both the RAF and RN standards to your optician and ask which you would pass.
2. Go to the RAF and RN officer careers officers and ask for station visits etc. The RN run sixteen aircrew officer acquaint courses a year, (eight each at Culdrose and Yeovilton) that last four days, which will give you a good insight.
Take with a pinch of salt the RN "officer first, aircrew second" - it's only true up to a point, and the reality is that they are hardly going to select and train a pilot and then make him spend most of his time in charge of the anchor party.