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I’m 15 months in and still find learning a song difficult.
Part of the key is finding a song you love because you are going to spend a lot of time with it during the learning process. Look up the song on Ultimate Guitar and YouTube training videos. When starting out, you need to Simplify and play it Slow (this part is hard because you hear the speed of the song in your head and tend to want to play it at that speed). If you have an issue with a particular chord transition then stop trying to play the song and just practice that chord transition for several weeks/months until it’s not an issue. Simplify by perhaps only strumming once per chord or simplify the chord, or skip the chord. If you are making mistakes identify why and isolate that section and practice just it. Don’t continue making the same mistakes or you will end up learning the mistakes.
In general it takes me 3-4 months to learn a song that I would be willing to perform in front of other people. Don’t rush it and be patient. Enjoy the journey.