Is it possible to combine my day job as a construction site manager with a freelance career as a life coach?

Yes, it is, but only if you can compartmentalize your life and mind, i.e. focus totally on the immediate issue and discard all else. I worked 9-to- 5 and more as a marketing manager for a construction company and jump-started my real career as a freelance writer after five, on weekends, and occasionally while flying to meetings and filling time in hotel rooms. I soon was earning more freelancing than I did in my conventional job, and I was enjoying it more as well. I soon progressed from part-time freelancing to full time, thanks in great part to my ability to compartmentalize.

In my book, The Power of Being Articulate, I note that…

Perhaps ‘compartmentalizing’ has been replaced recently by ‘multi-tasking,’ the supposed ability to concentrate on more than one matter at a time, which is an illusion: nobody can truly focus on two cerebral tasks simultaneously. The operative words are ‘focus’; and ‘cerebral’; If you don’t believe that — and many of my peers fall into that trap simply because they are addicted to what they think is multi-tasking — consider that a student of mine argued that multi-tasking was possible. He then started to read in class as I was professing (reinforcing what I’ve said too often: that paying attention is the scarcest skill). I stopped talking, waited in silence as he read, and, when he finally realized that something was amiss, he looked up from his reading, and I asked what I had been saying. He had no idea. “Why weren’t you multi-tasking?”; I asked. He blushed, so I knew that he, and the other students, got the point.