That is easy! A handheld lemon squeezer is the easiest way to juice a lemon. This is the lemon squeezer I have and use at my house or if you want a super fancy one that is easier to squeeze, try this lemon squeezer. I roll the lemon a little on the counter to loosen the juice, cut the lemon in half and place one half in the lemon squeezer over a cup or measuring cup and squeeze.