@Preston Dahl My husband and I just finished rehabbing our first 4 unit and did most of the work ourselves. We did it mostly out of financial necessity, but there were other benefits as well. I'd like to think I'm a serious investor, but only time will tell. I know I could spend my time sourcing deals and money, but as I'm working on the first project and have no other experience/cash to invest I doubt I could have done better with my time than painting, flooring, demo, kitchen install, etc. Plus, the knowledge and comfort with rehab I have will be invaluable when hiring things out in the future.
Like you, I don't enjoy my white collar job and find few things as satisfying as working with my hands; personally I love flooring and landscaping. Nothing like laying out 4 tons of landscaping rocks to make you feel accomplished! So I understand where you are coming from as far as enjoying the work as well.
Have you ever worked at a start up and seen a CEO take out the trash or a VP of research stock lab supplies? They don't plan to do it forever, but they do it to save precious cash while the business takes off. That's how I view our decision to utilize sweat equity in the first properties. In a few years when we have more doors, more experience, and much more $ it will be silly to do $50/hr work (it's expensive to hire work in San Diego!).
One thing to help make your decision will be how long it will take you to do the work vs hiring it out. How much will you save vs lost rent? Also, don't forget that hiring out work doesn't mean you can set it and forget it. You really need to be on top of contractors.