Remove anything you can from the needlebar and anything in the way. Usually there is an arm or something holding the needlebar in place. There should be a set screw in the arm. If you can reach the set screw and pull it out you might be able to tap the needlebar out. From my experience, the needlebar will look more bent when it is out than when it is in. Then you will need a straight needlebar, put everything back and then time the needle with the hook - hard part. The hook has to go behind the eye of the needle as it passes and pull the thread up - yes there is a sweet spot. You might look for an adjuster's manual. The needle bar in my machine has the set screw in a position I can't access. Maybe someone here knows how to do that kind of magic.