Choose 2 cords, lets say G and D. Make a G, release and make it again. Switch to D, do the same thinng. Back and forth for say 15 minutes. Then choose two other chords and do the same with them. At first take it slow make sure each string rings clear for each chord. When you can do that, how to make the chord should be burned in.

Work using the chord patterens till you start getting enough speed to keep up with chord changes. Then start changing the chord patterns to build speed with other chords.

Build confidence in yourself by not always looking at you fingers.