<human>: I'm 25 and have only had one real job, and the interview process for that was fairly...unconventional, so I have no idea what I'm doing. I work in IT, and my boss, as awesome as he is, has made it clear that even if I went and paid for any advanced certifications out of pocket, I should not expect a reimbursement for the cost of the exam, nor an increase in pay. I feel very loyal to my boss, but I am trying to get engaged and have ~15 dollars left each pay cycle after bills and groceries. So at night, I've been looking for jobs on Dice, CL, Monster, etc. I stumbled across a job on the /atljobs/ subreddit that I believe I am qualified for (which is awesome since I've only been employed for 3 years). I even got an email back asking about a phone interview!

This is where my issues begin. I have no idea what I'm doing on the job market. I got this job because of convoluted interpersonal associations and a personal recommendation from a friend who had basically an identical job. I don't know what the professionally appropriate way to schedule a phone interview is. I feel that it isn't right to field a phone interview while I am on the clock at my current job, but I also recognize the fact that the person (or people) doing the interviews very well may have zero interest in coming in early or staying late to speak to me.

If it makes any difference, I have made vague references to the fact that I am looking for a new job, but haven't directly told my boss I am re-entering the market, as I have zero savings and still need to be able to make rent in case things go bottoms-up.

Can you summarize the given text in a few sentences?
<bot>: No idea what professional courtesy is on phone interview scheduling while currently employed, worried scheduling may come back to bite me later. Any advice?