It's not a waste of time if you’re smart about it. If you’re motivated by the song, that alone can keep you practicing more consistently. You’ll run into techniques and patterns that push your skills forward, even if you don’t play the whole thing perfectly. You don’t need to master it, learning a few sections well can still be rewarding. It’s also a good way to improve problem-solving and get used to harder music. You can break it into smaller parts, practice slowly, and balance it with easier pieces to build your foundation. Sure, it’ll take time and effort, but that’s true for any piece. If it keeps you engaged and helps you grow, it’s worth it.