Home (inkjet) decal printing is certainly feasible. The difficulty depends on the color. Dark decals to go over a light finish color are easy. Light decals are a lot harder. You use white decal paper. The problem is that the whole decal sheet is white. So you have your choice of two methods.
One, you must trim the decal precisely to prevent a white ghostlike surround. Second, you can set the background color in your graphics software to the color of the area in which the decal is being applied. However, color matching of inkjet printing is not the easiest task in the world.
Personally, I use a combination of the two. I do the best I can on color matching. I then trim as close to the decal as I can, so that there is little area to the background color on the decal, and it is usually not too noticable.