Watch the Waltz For One online guitar lesson by Brooks Robertson from Fingerstyle Survival Guide
As you watch the performance video of Waltz For One notice the techniques used by the right hand. There are a few times when the thumb moves up and plays the G string and there is also heavy use of double picking between the thumb and index finger when the melody is played on the lower bass strings. Double picking really just means that the thumb and index alternate playing the same string, however double picking could be any combination of two digits alternating on the same string. It’s an articulate and efficient way to play notes quickly on the same string.
With the left hand see if you can be aware of when a whole entire chord form is being held down or if it is just one or two fingers playing a melody note or a partial chord form. It’s important to move a minimum about between chords to achieve fluidity in the song. It’s also important in this song to let the notes sustain and ring out into each other, generating some beautiful overtones. As always you can use this video as a practice to play along with once you've worked through the breakdown slowly one piece at a time.