Hei Nuuska!
Both the front and back plates of the typical steel string acoustic guitar are designed as independent components that glue to a small ledge (kerfed or solid lining) along the outermost rims of the sides. Removing either of those plates is pretty straightforward, as you simply cut through the binding, side wood and linings. Care must be taken to remove the plate from the neck and heel block. The project involves aesthetics more than anything else. After the plate is reinstalled you must completely replace the binding you cut through and touch up the finish.
You can certainly remove the back plate to gain access inside, and this can be a very effective way to adjust (or "tune") the bracing. There can be a complication: The neck heel of most acoustic guitars often terminates just past the point you would be removing. It is fitted, glued and finished in such a way that it makes/can make it quite messy to remove a back (let alone, reinstall the back) without first removing the neck. Of course, once you have the neck off, taking off the back or the front is the same work.
In my case, I had already determined to replace the soundboard, so I was removing the old one anyway.