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Think your over thinking it. Misaligned (not perfect) applications were typical and depending on decal some are not applied to smooth surfaces so they are going to float in some areas while laying flat in others. For larger exterior decals/stripes many of us use water with a little Dawn or other additives but that is a whole 'nother subject Many of the reproduction stickers have the backing split so that you can position the decal to get it where you want. Hold one side down in place while you removed the backing on the other side. Roll the decal from the side your holding in place out to the end of the sticky side and press. The fold carefully back the unstick side, remove that backing then roll the fresh side back onto the object out to that end.