Expressing breastmilk and problems

Hello mummies, wonder if anyone face the same problem as me during breastmilk expression. I have clots in my ducts and to express the milk, i had to massage while expressing it and it took me almost an hour to empty my breasts/not feel clot each time. I tried massaging it before expressing but it does not help as much as massaging it while expressing. Did you face the same problem or what other problems you face and how to resolve it? #advicepls