This is what i went by .
Once you have 1 year expenses set aside .
Make as much affiliating as you do your regular job .
Listen if your making as much affiliating as you do your regular job and it is enough to support you , no need to kill yourself working 2 jobs . Be sure you have a year expenses set aside just incase .
Also if there is no room for advancement in your current job . If you know you have a chance to move up and in few years be making a huge salary and job security it would be dumb to quit .
For the extra ss taxes . Register as an llc and file as a scorp . In this you pay yourself a small weekly salary and that is your paycheck . Everything else earned is claimed as a dividen and theres no ss takes on that .