Notice
Mood for a Day is a formal composition. For that reason it should be approached as a solo performance piece with the attitude that it should be learned cold and performed from memory. You will find this an especially hard piece if you have no experience with classical guitar technique. When I learned this years ago, I was mostly concerned with fingering and getting all the notes right. As far as tone and technique, I just did what I could. Don't worry if you can't use all of the fingers on your plucking hand. Use just as many as you comfortably can. My trick is to alternate between my index and second fingers for all of the upper lines, while my thumb takes care of the bass movement. Two exceptions which I found helpful were in the case of faster notes like the cadenza-like phrase beginning at bar 17: here I'll use only my thumb to achieve even execution. The other case would be to play the full chords of the intro, recap and the Bm which follows, with your thumb alone or possibly by alternating between downstrokes with the thumb and upstrokes played by the remaining four fingers.
The best way to deal with the grace notes is to completely ignore them. At first don't even look at them. Then, once you have the logic of the particular line, add the grace notes without obscuring the rhythm of the primary notes.
Some final tips: Learn the piece in sections. Once you get it under your hands, be sensitive to tone, dynamics, and possible
changes of color by adjusting both your right hand position and its attack accordingly. Listen for the right contrapuntal balance. Lastly, don't let the piece play you. Learn it thoroughly by studying the harmonic progression from which the lines you are playing were derived.
