I feel the general advice is don't do it and with good reason!
However, I feel that if you have good skills this should be the way to go. Hustle and get profitable. It is not that difficult using services.
The moonlighting alternative sounds appealing but I find the progress to be extremely slow and there are just too many distractions to really make it useful.
I know there are people who do it successfully, but I feel they are supermen and a notch above most.
Just my 2 cents.