Progressive lenses need to be fit by a licensed optician. The way the bifocal in a progressive lens is set is typically to align it with the lower lid. Keep in mind a progressive lens is not just a bifocal, but a trifocal. If you are doing quite a bit of intermediate work, they might just work for you. If you've started with a straight-line, or d-segment bifocal however, I would not recommend switching to a progressive.
Pantoscopic tilt is generally only an issue if you're extremely myopic (nearsighted), typically it only comes into play with prescriptions over -7.00 diopters or more.