How would I go about incorporating retin-a if I use metrolotion or gel twice daily?  Would I put on the retin-a after everything else?  The morning isn't a concern, since I would just use the metrolotion, but the evening, I'm not so sure about.  Does anyone use both products at the same time?  Should I just use one at a time?  How does the below look?

Evening:

Cleanser
metrolotion or gel
moisturizer
retin-a cream every 3rd night

Or should I leave off the metrolotion or gel on the nights I use retin-a cream?  Will they inactivate each other?  Or too many actives on the skin at once?

Any comments or suggestions will be very much appreciated!

Beth