Here is some basic advice on eyebrow care. If you want to reshape your eyebrows, just visit a local salon/spa that does this and get them shaped professionally.
Tweezing only pulls single hairs, but waxing is what is used for shaping. Don't use threading or permanent hair removal systems - eyebrow shaping does change the appearance of your face.
Knowing which hairs to take the tweezers to and which ones to leave alone will make the difference to properly shape the eybrow.
Sometimes if you get carried away, you may leave a thin line and this is really hard to fix, so best to get help if shaping eyebrows.