Thank you all for your input!
Tartan- well, THAT would explain why it's actually feasible for some! I didn't know that machines actually came w/out a pedal. I'm thinking that with an older model machine that does have a pedal, that perhaps the seated position would be a better option (and all of the ergonomics that go with a seated position). Thank you for letting me know about the "no foot pedal" machines! (And thinking I might be considering an upgrade...)