Jack, I'm not going to dwell on the previous post beyond saying that you need to be as fit as you can be and possess the physical and mental robustness to cope with a most demanding training regime. You also need to have a level of maturity and level headedness that is required to be a SNCO in the RAF - although you would be younger than most ground trade Sgts, you need to demonstrate the same judgement and decision making powers that any of them would have. The difference would be that you've come in as a direct entrant SNCO straight from school or college, whereas other Sgts will have worked their way up through the ranks and earned their stripes the hard way. I hope you can see why you need the easy confidence and credibility to work alongside such people, you can't afford to be anything less than the best. There aren't two classes of SNCO, and airmen will make no distinction between an aircrew Sgt and a grizzled old ground trades one - if you can't cut the mustard, they'll walk all over you.
It is perfectly possible to join at 18, but you would be strongly advised to gain some 'life' experience as has been suggested. Any job or role involving working as a team would afford you the opportunity to practice and develop your leadership potential and such an experience would be invaluable for when you apply for RAF NCA .
Finally, while doing your research, you will hopefully discover that these are exciting times for the WSOp trade. As the CDS, General Sir Nicholas Houghton, said in a speech at RUSI last week:
"I cannot stress enough the need for a greater qualitative and quantative investment in intelligence, surveillance, understanding and those capabilities that permit the precision application of hard power. I expect us to invest more in refreshing our current inventory of Reaper, Sentinel, Shadow, Air Seeker and Sentry."
Defence (and politicians) have finally twigged that ISR is a critical capability in the battlespace today, and all the platforms he mentions require WSOps to operate the missions systems. To those platforms you can probably add a new (as yet undecided) MMA aircraft, which will finally plug the gap left by the Nimrod MRA4 cancellation, and will require a large cadre of WSOp sensor operators.
If you want one of those seats, you'll need to be well prepared, both mentally and physically. I'm sure you can do it, but it's up to you mate!
If you need any help with your research into the life of a WSOp and the types of platform, feel free to PM me and I'll try to assist if at all possible. I have some experience in these matters.