OK, here it goes, When playing for longer than 30 mins, I am fine, but when I play certain songs, my Left hand (on fretboard) Gets tired and sore, but playing other songs, for long periods of time, its fine. How can I build up more endurance besides just playing a whole bunch? Then a finger question, this one I prolly already know the answer to, How can I build up finger strenght and endurance, I cant really rely on my pinky finger to do anything. On a side note, I have played flute for 9 years now, and my fingers work pretty well for that, I guess its the 'slight increase of presure' that effects my fingers... Thanks.