Do you want my honest answer?
Of course it is possible, but it is tough, especially the working with 3 bit. And the dynamic changes in the family. We both work full-time and it is hard work prioritising, getting everyone out of the door, coping when one or more is ill (this is the hardest bit currently). The house is a wreck, we have very little sleep or time to ourselves, either individually or as a couple. Funnily enough, all the willing helpers who'd have two over for the night, suddenly disappear into the background with number 3 .
Both the older boys were besotted with DS3 when he arrived. After 3-4 months, the jealousy kicked in and DS1 hated DS2, and DS2 hated DS3. Still now, 18m later, there is LOTS of jealousy and sibling rivalry and we're probably too damned knackered to give them all the attention they need.
If I felt I wouldn't be exploited in my job by going part-time, I would do it like a shot. On the other hand, work can sometimes be a welcome break. I think it will get easier when there are fewer broken nights, illnesses and nappies.
And we will have to buy a new car at some point in the next couple of years to fit them all in with proper carseats. And we will never go on holiday abroad again apparently.
But - here's the thing - I wouldn't change it for anything. I have tribe of little boys who are marvellous and cute and smart and funny and lovely and they get 'good enough' rather than perfect parenting and housework.
We can also afford a cleaner and have no commute to work/school/nursery and have good childcare. If either of us were not 100% parents or we had really long hours out of the house we just couldn't do it...