Please help......decal removal????

So, put my decals on my 1/72 Fok. DrI and they went on beautifully.  The prob. is that looking back on it, I don't like the white trim around the crosses as it is too white and doesn't match my toned down dirty crossfields.  I put the decals on with Testors Decal Set last night and have not covered them with anything yet.  Can I put more decal set on there and be able to remove them without messing up the plastic or paint?  If not, I will just chalk it up as a learning experience and next time, try and cut out the black crosses and leave off the white boarder.  I guess they do that (Revell) since they figure people will do the plane in red and then the white cross boarders would look appropriate. 

Thanks!