I remember starting out trying to switch from one chord to another too... I think the hardest thing for me was to go from Open chords to Barre chords. I would hesitate for ever between chords. I thought I would never get through it... However, practise makes perfect.... Believe me, all things come to pass.

Don't get caught in the same ol' practise exercises. Try other exercises and songs. You need to constantly put things in front of you that keep you inspired. Get with other guitar players and have little jam sessions... I found out that the best jams are the 3 chord songs that can be learned easily. Blues, Rock and Country songs all fall into this catagory.