Yes!
Well, kind of.
At 28, I was getting sick of my salaried job (long hours, weekend work, typical DC consulting gig). It paid $60k which was pretty typical for a non-doctor, non-lawyer, non-programmer, non-PhD job.
The husband and I crunched the numbers. We couldn't pay the bills in his salary alone. He was making around $50k gross. Our STUDIO apartment--meaning we didn't actually have a bedroom--was around $2,300/month.
We figured I needed to make $20k to continue paying the rent. I don't think we factored in retirement contributions. I wasn't contributing anything at the time and he was maybe putting in 5%.
I left the salaried job and started my own gig. I was really surprised to make $75k the first year. My goal was $20k! I gave away SO much work for free that year--free workshops, free webinars, free consulting hours.
The second year, I made $180k. The third year, I made $210k. This year, I've scaled back--4 days a week to have more mommy time--so I might hit $150k and then be finished for the year. I've said that a few years in a row, though... so who knows! But I definitely don't work full Fridays anymore, and I do minimal work at night and on the weekends.
Pull the trigger!!!
But maybe do more budgeting than I did. And aim higher than $20k for your first year. :)