A professional is the best bet. If you do it yourself...treat it first with Ortho's liquid weed and crabgrass killer. Make sure it includes quinclorac. That should kill whatever weeds and crabgrass are present. Then apply the Halts step 1 to prevent any additional crabgrass seeds in your soil from sprouting. You are not alone--going to be a tough year. But maybe frost will kill the early crabgrass...frost is common in April. I have some experiments to see if crabgrass control like dithiopyr will kill early crabgrass. I also have a few pots of crabgrass inside for future tests of chemicals.