Re: Removing gloss
You can rub over the surface with 0000 steel wool. This is so fine that you should avoid individual scratch marks. This worked a treat on an acoustic that I wanted to de-gloss, and I've heard others do it on solid bodies too.
Obviously there is a chance - as with any attempt to change the finish - that it will look wrong afterwards, so best to test it on a little-seen area if possible, and probably best not to do it on an expensive guitar unless re-sale value will never matter.