(lots of patience)
Now you get to apply skills you learned in Kindergarten or Pre-school. You get to use scissors (No running now!)! I recommend some really sharp scissors that can be manuvered easily. Scrapbooking scissors work like a charm here. Hobby Knifes/Exacto Knifes can be used too, but you can leave "pressure" marks on the decal where you place the knife down to start a cut. When you cut the decal out you want to leave an "edge" around the decal. On "Professional" decals, you can see the actual edge of the decal. For these your want to leave a paper edge around the actual decal. For homemade decals on clear paper, your edge is a little sliver of "clear" around the actual design. For homemade decals on white paper, your edge is typically the color background you used that matches the color of the model. If you used a black outline as an edge and dont want the black to show, you need to cut carefully to the inside edge ofthe black...which can be VERY tricky. I tend to only cut the decals I need for a specific model at one time and once those decals are applied I move to cutting out/applying decals to the next model. It is easier to organize the decals while they are on the sheet as opposed to wrangling down a bunch of loose decals....some of which can be small. Nothing worse than cutting everything out and have to stop mid-process and run the risk of those decals getting blown/moved around and all jumbled up....or even lost! If they stay on the sheet till you need them this doesn't happen.
Once the decal is worked into place and dry (allow a few hours at least). It is time to seal it with gloss varnish. Put a coat of gloss varnish over the top of the decal and over the edges. This SHOULD prevent any air getting under the edge and cause the decal to lift off the model and cauese it to have a silver background. All the steps we took to this point are our best attempts to minimize this silvering.
The decals should be firmly set and worked into any detail at this point..."but SonBae they're glossy!" No worries. Just hit them one time with some Flat Matte and you are good to go...the shine will be gone. And if you hit them with a Flat Matte finish now, you are in a perfect position to have you first requirement to apply pigments!
That's all there is to it. Hope this helps and as allways, let me know if you do something a little different...I am always looking to expand my skill set.
Happy Painting!....or should I say Happy Decaling!