"This boy is a hard person" is not correct?
NO liasion between est et une. Heard is a couple times to listen to the lack of liasion. Thought it would sound like es-T-une...
You are right.
Is there or is there not supposed to be a liasion?
there should be a liaison: EH-T-UNE
Do you use the feminine personne, even when referring to a boy?
Yes, "personne" is definitely a feminine noun.
I can translate it, but I cannot understand its English meaning!