Also depends on what chords you're switching between. There are the basic, ACDG etc chords that everyone struggles with as a begginer, then there are the more advanced chords that even annoy the veterans. I'm guessing you're in the first group. Just practice switching between 2 different chords. once you get used to the feel of each, its just a matter of changing your hand shape as you're moving it to the next chord.

It can take a while though, just keep taking it slow and not try to rush through the song making mistakes. Correct them first.