You not got a small vice like zw1_3yvXiyr4WVokNFhzMFu_ZsoByqCSlqvk89vW91vw3RsIaAnpWEALw_wcB
That's what I used doing my 4790k. A bit of tape on the Jaws, one jaw on the IHS and the other jaw on the the back side the green plate so cpu is at a slight angle and slowly close the vice so IHS and back side of cpu are forced opposite ways..