They do mask kits but because i seem to like the hard way to do things so i would more than likely paint the lightest colour all over first, draw the splinter scheme on that and then use Tamiya tape and mask away.
After masking i would spray a thin clear coat to stop any bleeding under the tape of the colour coat. Four colours so three mask sessions overall.
Being 1/48 she is going to be decent sized which wouldn't make it too painful. It would be a cool project as she is a great looking jet.
