If you read my article Smooth Shifting on rear derailleurs, you probably learned some tricks that will be useful in adjusting the front derailleur as well.
The front derailleur can be tricky because the mechanic must first make several adjustments to align the front derailleur with the chainrings before making any useful adjustments. These alignments are made by eye. New front derailleurs come with a guide sticker on the outer plate to help line the outer plate with the teeth on the largest chainring.
Some front derailleurs are mounted in a fixed position on the frame and cannot be adjusted. If you have a fixed-position front derailleur (like and e-type or direct mount), you can skip the first step assuming the derailleur, frame, and chainrings on the crank were designed to work together.