TAB Example 1

 I -  IV - V Chord Progression in the Key of A

 I                  IV               V

A Major – D Major – E Major

You need to be able to change from one chord to the next without any hesitation.

All this is, is practice, a lot of repetition till it is right.

You need to be able to play these chords in any order and in time so when you try to strum or pick a tune or song you can change from one chord to the next without any gaps.