This is my advice . . .
if you can do anything else and be happy, do that.
I completely agree with this statement. Stage Management is one of the most difficult, time consuming, thankless jobs I have ever even heard of. You have to fight to get work and (if you're doing a good job) will constantly work far outside of your job description for the sake of the show. This is a job where you give up everything for your work, ie weddings, birthdays, births, deaths, holidays, your health, and sanity at times. It requires a huge amount of stamina and initiative, and very few people are paid well.
If there is a question about whether you want to do it or not, then don't do it.