It is always a good idea to have someone with you, near you, or in whatever way reachable. This is why I ALWAYS carry my cell phone, even if working around the house. Anything can happen, from heart attack to work-related injury and you may not be able to rush to someone asking for help.

One day I was working around the house and some building materials collapsed around me. I had my cell phone on me in case I had to call my wife. But it was not that bad and I was able to free myself.

So, if it is what you have to do, bribe someone to be with you. If that is not possible, at least call them time to time and tell them where you are and how things are going.