Hi Looma, not a problem, even with a basic airbrush you can achieve good results.
Net_sailor has provided a great yet simple method, get your mixes and pressures right and practice.
Now, paints for that 290, still working on a top side mix for those 72/73 greens, when you look at paint chips they are very close to the same, yet some photo's which claim 72/73 show a reasonable tonal difference in B/W pics while colour shots show 2 quite different shades of green! Anyway will keep studying and mixing, you're not in a major hurry are you?