For many checkout pages, a progress tracker is touted as a good idea to help guide a user through the purchasing/checkout process (as outlined in this article: http://www.smashingmagazine.com/2010/01/15/progress-trackers-in-web-design-examples-and-best-design-practices/).
However, most of the examples I have seen, consist of 3 or more steps. If my only required steps are login/register (which is skipped if the user is already logged in), and the payment information page (choose payment type: either redirect to Paypal or fill in credit card information), would I benefit from a progress tracker?
For one, it would help give the user an idea of how little remains after login/registration. I'm just not sure whether it's necessary if there are only 2 steps (or only 1 step if the user is already logged in).