I wanted to do this for a long time, but always thought that it might be expensive. Until one time my brother in law was on non-paid leave for two weeks and he was looking for anything to do. We decided to give it a go. Everyday he would sit beside me, watch Netflix for all day and just look at my screen from time to time. Productivity rose _instantly_. After a single day I was thrilled, after a week I was absolutely sure that I need to hire someone after he gets back to his old job.

Some tips: the person you're going to hire must be somewhat cheeky. They must cut through your bs, force you to explain why you're on youtube, ask you if you really need that for your work etc. Furthermore, working side by side works better than through Hangouts, Skype and others. I have multiple displays and I've started to cheat the system as vast majority of screen share apps allow you to share single screen only. We're in process on finding an app that allows one to share all displays (you might need couple extra CPU cores if you have 4-5 displays).