On Etiquettal Conundrums - Part 1

So one context for this question is farewells. And in that context, one application of this topic is preparing the guest list.

The question, the topic is this:

• Is it better to underestimate how important you are to people or it is better to overestimate how important you are to people?

Which is more likely to hurt feelings? Which is more likely to tend to create ill will (however mild) or unfavorable last impressions?

Please discuss.

Photo Credits: here