Installing carpet tack strips

Any tips or tricks about installing tack strips without hitting the baseboard trim with your hammer? With the tack strips a 1/4" from the base the little nails are so close and makes it difficult.

Also when you go around a closet door frame what is the best way to do the tack strips? Typically you have base along the wall, then casing at the edge of the door, then you have your door jamb and in the middle of the jamb you have the door stop. Wondering if you cut little pieced to follow each jog in the door frame and keeping the 1/4" gap? A link to a picture of a correctly done doorway would be great.

Thanks