Basicly, what I want to know is - how hard is it to install a miner on a PC (as i have never done that before) and would it be possible to configure a miner to use low amounts of resources? I am thinking maybe to install a miner in my PC at work but would configure it so it would not critically halt my work, if that is possible.
Mining Bitcoin on a PC is a waste of time. You will mine only a couple of dollars worth of bitcoin in a year and you will pay much more than that for electricity.