Agree with Wade, it seems like such a daunting task at first but you just have to remind yourself frequently that it will NOT sound amazing at first and be kind to yourself and don’t set expectations too high.
I’ve been teaching my girlfriend simple folk tunes for a bit and have noticed she nails new songs (or at least large portions of them) when she is relaxed and not thinking too hard about what she’s doing. Especially with complicated chord changes.
Repetition is the biggest thing though, don’t ever forget that! I sing Going to Carolina from James Taylor and Hotel california from The Eagles while reading captions on bar TV screens nowadays so believe me - muscle memory and repetition lead to success!
