and tm) unless you are the owner of the mark., et ux or et vir (pronounced "eht veer") are used (mostly in legal circles) to define the other party as "and wife" or "and husband", respectively, even if the other party is then named.
traditional formatting for an em-dash does not use any spaces, as.
you find yourself saying "in other words," it means you didn't say.
The best thing to do is to use your good judgment, and you can always check with your instructor if you are unsure of his or her perspective on the issue.
Ultimately, if you feel that using first person has a purpose or will have a strategic effect on your audience, then it is probably fine to use first-person pronouns.