Hi Jeff!
Just as with our other plugins you can easily override and modify our templates – and as almost all text is passed through translation functions it may even be possible to leverage third party plugins like this one to make these changes 🙂
Also, can fields be added/removed in the ticket purchase form?
That is certainly possible, but is a more advanced customization to make and realistically you would need a decent working knowledge of WooCommerce and WordPress development generally to push this through.
Definitely achievable, though 🙂