Learn how to transition to different chords. One way to become proficient quickly is to learn how to transition between the various chords quickly. These transition periods are often the hardest for beginners to play when they are starting off. The more you practice between switching to different chords, however, the better you'll get at doing it in songs. Practice switching between open chords like G, A, E, and C. 
Start playing the different notes and hold the different shapes. Once you have a basic understanding of how the notes are played throughout the song, you can start to hold each of the chords. If the song consists of chords that you're used to playing, it will make the process easier. If the song uses different chords, it may take some time and adjustment to get used to them. Practice the chords separately if they are unfamiliar to you.
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