What Should You Know: Ten of Pentacles. I will be honest here: without knowledge of the situation, it's hard for me to be sure exactly what the message is here. My first thought, however, is to keep in mind that the person you need to speak to isn't out to harm you (regardless of whether or not they are, I don't necessarily think that is their intent); if they're aware of the situation, they want it to be resolved in a way that benefits you both, and if not, I don't think they have ill will towards you.
If that doesn't sound appropriate to the situation, in general, the Ten of Pentacles represents harmony and happiness, a stable home, and financial security; if the conversation has something to do with your home or financial situation, keep in mind what it is you want or your driving motivation behind bringing things up.

What Should You Do: The Hierophant. The Hierophant can be a card of traditions and hierarchy, so if there is some sort of institution in place, I'd say the message is to try and fit what you have to say inside those values and use it in your favor, rather than working against it. I think it's also worth noting that the Linestrider depiction of this card has a bear on it, specifically because, as stated in the book, it "brings strength and confidence and is associated with standing against adversity, taking action, and leadership" -- strength and confidence can be hard to find in yourself sometimes, but do your best to tap into your strength and do what you need to do.