Accompaniment for any song learn first without singing, in a very slow pace. This way you will achieve sufficient definition of the performance of each note will have time to follow the behavior of each finger. Otherwise, the chords even at this stage will be blurry, and your fingers will get used to the wrong position. Later this will result in discomfort, inability to perform rapid passages, and muscle pain.
Ready hand to change chords a little in advance (about one-eighth before the end the first and begin the second). During this period, you will have time to imagine the future position of the fingers. But to move his hand start only at the last moment. Do not worry if failed the first time: music training and analysis of any work associated primarily with the multiple repetition of one and the same place. Try until you get it firmly enough.
Learn the connection of chords in pairs. Watch out for the new chord from the first to the eighth sounded quite bright (all the strings are clamped tight) and clean (sandwiched right frets). Each chord easy grip with your fingers, without changing the fingering from execution to execution. Because of this you will develop mechanical memory and don't constantly look at the tool to find the right frets.
Speed up the pace gradually. New tempo move only when the source turned out to play five to ten times in a row without mistakes and blunders. Take short breaks every hour or two if you feel the need. Pay attention to pain: if they are, then you are doing something wrong: I put the wrong fingers, the hand in the wrong position or the other. Correct and continue classes.