Pour your trim paint in your tray or bucket (see the bucket/screen combination here:
19+ To Paint Or Not To Paint Wood Trim. We also have stained, solid wood doors on this level. Varnish is much more high.
With my most recent remodel i. It has a few tricks. All the trim on the first floor of our home is stained.
If you can paint models, you can paint the trim.
It has a few tricks. Stop when the bulk of the paint is gone, even if some color remains. Yours is not to wonder why. Paint thinner does just what the names says: