Carefully.
I'm by far not the best Gundam guy here, But I have built several Gundam models before I started painting and the one thing I know is those stickers fall off. And if you paint the whole thing its gonna be really obvious that there is a sticker in there. Just look at how the eyes look on the sticker and copy that with a really tiny brush. I think yours will have a black background with green eyes, but I could be worng since I've never seen F91. Maybe someone can pipe up with a better way to do them but what I would do is paint the black down, then a coat of silver or something where the eyes will go so the green doesn't get darker and then green. Actually if you did put down a layer of chrome silver you could do a clear green for a couple of coats. A kandy effect eye would look closer to the glowing of the Gundams than flat green would.
And hey, if you dont want to go through all the trouble and just want a nice Gundam to look at thats cool too, they dont have to be painted. I forget what it was but I read a trick somewhere about how to make those stickers stick better, so they maybe dont fall off. If anyone remembers speak up.