I bought a set of heavy duty 3" stackable bed risers online. I put 2 each (6" rise) under the legs at the head of the bed. To install them I wrestled the mattress off the bed then tipped off the box springs. I put the risers under the legs of the bed frame at the head of the bed, then put it all back together. You might need help with the mattress, it's the hardest part. With a helper you could tip the mattress off one side & the box springs (usually much lighter) off the other, then install the risers.