Looks like someone dropped it in the dust bin.
I'd try this....
Take off the grips. Remove the slide. Take the frame part outside and really hose it out with a full can of non-chlorinated brake cleaner. Use the little straw and get in every nook and cranny. Move the hammer, trigger, etc. Really get the parts under the sear cage and in the hammer spring area. Then lube it good. I use 5w30 on most parts, grease ob the rails.
Watch those videos a few times. When you get your courage up, give it a whirl. The "frustrating" areas are the sear pack if it has a 2 piece sear and the trigger bar lifter. sadly, polishing that lifter is one of the most important areas for a smooth trigger. No worries if you get stuck. Just drop a line here and plenty will assist.