Hi stevechristrian1,

Transitioning from an E minor to a D major is pretty tough at first because the two chords don't share any finger placements. When this happens, the only advice I can offer is to play switch to and from these chords slowly and just keep doing it until your muscle builds some memory.

Don't even worry about strumming the chords, just worry about your fretting hand moving from one chord to the next. Start slow and see if you can get the transition down, and then ramp up speed as you practice it more.

-Billy