Application

My ex-boss told me about a job posted at HR. I was a bit reluctant to apply for 2 main reasons- what would happen to my course if they pulled me off it? my good friend did a lot of this job previously and is planning on applying and I think she should get it, so I thought why bother if she'll get it and would be really upset if I got it?
But I did apply last night and as I was writing the cover letter, I could see why I would be good in the position. It really depends what they are looking for... If there weren't the 2 above factors, it would be a good permanent job for me.