Place a capo on the second fret of your guitar. This will make it easier to play the song in the original key of A minor.
Learn the main chords of the song. The song consists of four sections: A, B, C, and D. Each section has four bars and repeats twice. The chords for each section are as follows:
A: Am - Em - Am - Em
B: C - G - C - G
C: F - E - F - E
D: Am - G - F - E
Practice the fingerpicking pattern for each chord. The song uses a simple arpeggio pattern that follows the 3/4 time signature. For each chord, you will pluck the following strings:
First beat: bass note (usually the lowest string of the chord)
Second beat: third string
Third beat: second string
Add some embellishments to make the melody more interesting. The tab or sheet music will show you some notes that you can add or change to create the melody of the song. For example, you can hammer-on or pull-off some notes on the first string, slide or bend some notes on the second string, or add some grace notes on the third string.
Practice each section slowly and gradually increase your speed. Make sure you can play each section smoothly and accurately before moving on to the next one. You can use a metronome to help you keep time and rhythm.
Use a nylon-string acoustic guitar. The song was originally played on a piano, so using a nylon-string guitar can mimic the soft and warm tone of the piano better than a steel-string guitar.
Use a light touch and a thin pick. The song has a delicate and gentle feel, so you don't want to strum or pluck too hard or use a thick pick that can create a harsh sound. Use a light touch and a thin pick to create a smooth and mellow sound.
Add some dynamics and expression. The song has some variations in volume and intensity, so you want to reflect that in your playing. For example, you can play louder and faster in the B and D sections, and softer and slower in the A and C sections. You can also add some vibrato or slides to some notes to create some emotion and expression.
Have fun and experiment. The song is not meant to be played exactly the same way every time. You can add your own style and personality to the song by changing some notes, chords, or rhythms. You can also try different capo positions or tunings to create different sounds. The most important thing is to have fun and enjoy playing the song.