[ZX3 in progress]

So I have the week off from work and I need to do something! lol. So I want to pull the moldings off and start the prep work so that they can be painted. So I was wondering if someone could run me through a how to? Like what grit of sandpaper I need to use, do I need anything else? do I have to take all the glue off from under the panels or can it stay on and I just reinstall it? If it comes off do I have to put new glue under it again, and where would I get it from?

I'm just gonna do the prep work and then have a friend who owns a body shop paint them for me. Thanks.