You're on the right path to be thinking about using an agent. I can make money but I cannot make time, so the agent route is very smart in the convenience and time-saving.
You're absolutely not stuck. Those that have a problem must have some sketchy agents. My agent did a fantastic job for me in getting everything established and I have no problems choosing to do it myself thereafter. So don't discount the agent method.
I understand. I've hung out with a few successful people and learned to delegate or outsource tasks to others when possible. I save that time for myself to do strategic thinking for my business or for education, and the rewards far out size the cost. And those costs are so much lower in Thailand it makes it even more doable.