Hondo44, one of our gurus on the forum recommends just getting one of the spray CLPs (cleaning, lubracating and protecting) and removing the grips and spraying through the action until the gunk and crud flushes out, and then drying with a rag and letting it drain until all the excess is out. Replace the grips, and you haven't risked screwing anything up, and all the old crud and dirt is out, and it is lubricated. Just a thought, and you can always go further later, when you have become more familiar with the platform. Most of us who work on these guns have crafted specialized screwdrivers and other tools specifically for each particular model, so that we don't round out the screw slots, etc. "less is more", when it comes to working on one of these fine revolvers.
By the way, welcome to the forum. You will find some of the most knowledgeable folks in the firearms world here, and they are mostly a very collegial group.