basically yes Paul, the decals in water (does not have to be warm) then slide them into location on the modell.
but what i do.... were the decals go i firstly give the area a drop of gloss varnish, then apply the decal, dabbing it with a dry tissue once in its location, then i paint over it with with a decal softener and then paint over with a decal fixer, then once all dry, another thin coat of gloss varnish, this hides the area around the decal that would normally come up mat...
once all this is dry i then spray the hole hull in satin varnish...
hope this helps..