I've worked 2 jobs a couple times, but never commission, so I can't comment on that. Just be careful you don't burn yourself out. And you probably are looking at sacrificing family time. Make sure its worth it. I worked two full time jobs and it really did put a strain on my marriage. Its not just time with family you have to balance out - you need time for yourself and sleep too. All those balls in the air become very tricky to juggle if you aren't careful balancing both jobs.