hatrick- suprisingly upbeat, i occasionaly think OMG what am I doing but then I don't find 3 particuarly difficult. How old are your dc's?
I think it does depend on circumstances and the children. I have a very hands on DH, no other help from parents etc
I also have 3 horses,1 dog and 3 cats but IMO it is about being very organisd,time management and being able to prioritise.