To start learning Sahiro - Un Sueño chords, delve into these chords sequence to get the song's feel: F#m, D, F#m, E and F#m. To master the tempo, it's wise to start at 48 BPM before aiming for the song's 97 BPM. Fine-tune the capo based on your vocal range, ensuring it complements the key of F# Minor.