Well, I'm self employed and I manage to do it; it is possible but it does take a bit of thinking round. I do have hubby working but he's not really around to take care of the children, so I have to do that myself around my working.
Is your work from home or outside the home? I'm lucky in that I work from home, so all it took for me was to get the children into the habit of being set work, not being allowed to disturb me, and doing my work while they get on with theirs. My youngest was 8 when we started working this way, and it seems fine. When I am not working is when we do the exciting stuff, trips and visiting friends and things.
It's not easy, we started back at work last week and by Saturday I was utterly exhausted with trying to fit it all in; I don't get a minute to myself. All the time that would be my relaxation time when I'm not working is spent helping the girls. However, I know that a couple of weeks down the line things will have settled enormously and i'll be absolutely loving every minute again! Plus, my girls are so happy and doing so well in every way, I wouldn't cahnge it for anything.
And here's my other point, work when you home ed doesn't have to be in school time. It wouldn't work for us at all if it was. The girls do most of their work that they can do without me first thing in the morning while I am working, relax in the afternoons while i work, and then in the evenings when I have free time we go over any stuff they need to together. Our days off are sometimes in the week and sometimes we do stuff on a Sunday to make up for it.
So you could educate DS on a Saturday or Sunday and let hime relax in the week. At his age he won't need very much one-to-one work to keep level with what he would be doing in school - it's a very efficient way of learning.
The main issue for you is whether your son can be with you when you work. If so, you have no problem, it's just a bit of working things around. If not, it's harder, and depends if you can afford childcare, really. There are plenty of home educating childminders out there who would take your child and do lots of lovely, fun and educational stuff with them (I am friends with one!) You would find your son picking up so much that you may well not need to do any sort of formal work with him. However, that depends if you could afford the money for that option. On the other hand, you will find you save a certain amount by not going to school, so it may weigh itself out more than you think. Also, what do you do in the holidays? Could you do that all the time?
Only you can decide if it is right for you or not as an option, but I think it is certainly possible if you are determined enough.