How hard is it to be able to do pull-ups?

Okay, this is kind of a silly question, but that’s what the collective is for, right?

I’m a 5’2”, 105 lb female with a poor to average level of fitness, as in, I can currently do about 1.5 pullups. : / Anyway, for no reason at all I bet my boyfriend that in three months, I could do ten pull-ups (at a time.)

Is this at all feasible? Does anyone know anything about fitness, specifically pull-ups, specifically females and pull-ups, and have any idea how hard I’d have to work to be able to accomplish this?

Thanks. : )